# Japan at the 2020 Summer Olympics

Japan was the host nation of the 2020 Summer Olympics in Tokyo, originally scheduled to take place from 24 July to 9 August 2020 but postponed to 23 July to 8 August 2021 because of the COVID-19 pandemic. Since the nation's official debut in 1912, Japanese athletes have appeared at every Summer Olympic Games in the modern era, except for the 1948 Summer Olympics in London, to which they were not invited due to the nation's role in World War II, and the 1980 Summer Olympics in Moscow, as part of the United States-led boycott. The opening ceremony flag-bearers for Japan are basketball player Rui Hachimura and wrestler Yui Susaki. Karateka Ryo Kiyuna is the flag-bearer for the closing ceremony.
Japan finished the Games with 58 total medals, 27 being gold, an impressive improvement of the country's previous record performances from the 1964 Olympics (also held in Tokyo) and 2004 Olympics. This placed them third overall by gold first ranking (for the third time after 1964 and 1968) behind the United States and China. By total medals, they also fell behind the Russian Olympic Committee and the United Kingdom. It was the most successful Summer Olympics in Japan's history.

## Medalists

The following Japanese competitors won medals at the Games. In the by discipline sections below, medalists' names are bolded.
| Medal | Name | Sport | Event | Date |
| Gold | Naohisa Takato | Judo | Men's 60 kg | 24 July |
| Gold | Yui Ohashi | Swimming | Women's 400 metre individual medley | 25 July |
| Gold | Yuto Horigome | Skateboarding | Men's street | 25 July |
| Gold | Uta Abe | Judo | Women's 52 kg | 25 July |
| Gold | Hifumi Abe | Judo | Men's 66 kg | 25 July |
| Gold | Momiji Nishiya | Skateboarding | Women's street | 26 July |
| Gold | Shohei Ono | Judo | Men's 73 kg | 26 July |
| Gold | Jun Mizutani Mima Ito | Table tennis | Mixed doubles | 26 July |
| Gold | Takanori Nagase | Judo | Men's 81 kg | 27 July |
| Gold | Yamato Fujita Yukiko Ueno Nozomi Goto Yukiyo Mine Nayu Kiyohara Haruka Agatsuma Yuka Ichiguchi Yu Yamamoto Hitomi Kawabata Mana Atsumi Minori Naito Saki Yamazaki Nodoka Harada Sayaka Mori Eri Yamada | Softball | Women's tournament | 27 July |
| Gold | Yui Ohashi | Swimming | Women's 200 metre individual medley | 28 July |
| Gold | Chizuru Arai | Judo | Women's 70 kg | 28 July |
| Gold | Daiki Hashimoto | Gymnastics | Men's artistic individual all-around | 28 July |
| Gold | Shori Hamada | Judo | Women's 78 kg | 29 July |
| Gold | Aaron Wolf | Judo | Men's 100 kg | 29 July |
| Gold | Akira Sone | Judo | Women's +78 kg | 30 July |
| Gold | Koki Kano Kazuyasu Minobe Satoru Uyama Masaru Yamada | Fencing | Men's team épée | 30 July |
| Gold | Sena Irie | Boxing | Women's featherweight | 3 August |
| Gold | Daiki Hashimoto | Gymnastics | Men's horizontal bar | 3 August |
| Gold | Sakura Yosozumi | Skateboarding | Women's park | 4 August |
| Gold | Yukako Kawai | Wrestling | Women's freestyle 62 kg | 4 August |
| Gold | Risako Kawai | Wrestling | Women's freestyle 57 kg | 5 August |
| Gold | Ryo Kiyuna | Karate | Men's kata | 6 August |
| Gold | Mayu Mukaida | Wrestling | Women's freestyle 53 kg | 6 August |
| Gold | Takuto Otoguro | Wrestling | Men's freestyle 65 kg | 7 August |
| Gold | Yui Susaki | Wrestling | Women's freestyle 50 kg | 7 August |
| Gold | Kōyō Aoyagi Suguru Iwazaki Masato Morishita Hiromi Itoh Yoshinobu Yamamoto Masahiro Tanaka Yasuaki Yamasaki Ryoji Kuribayashi Yūdai Ōno Kodai Senga Kaima Taira Ryutaro Umeno Takuya Kai Tetsuto Yamada Sōsuke Genda Hideto Asamura Ryosuke Kikuchi Hayato Sakamoto Munetaka Murakami Kensuke Kondo Yuki Yanagita Ryoya Kurihara Masataka Yoshida Seiya Suzuki Atsunori Inaba Makoto Kaneko Yoshinori Tateyama Yoshinori Murata Hirokazu Ibata Masaji Shimizu | Baseball | Men's tournament | 7 August |
| Silver | Funa Tonaki | Judo | Women's 48 kg | 24 July |
| Silver | Daiki Hashimoto Kazuma Kaya Takeru Kitazono Wataru Tanigawa | Gymnastics | Men's artistic team all-around | 26 July |
| Silver | Kanoa Igarashi | Surfing | Men's shortboard | 27 July |
| Silver | Tomoru Honda | Swimming | Men's 200 metre butterfly | 28 July |
| Silver | Hifumi Abe Uta Abe Chizuru Arai Shori Hamada Hisayoshi Harasawa Shoichiro Mukai Takanori Nagase Shohei Ono Akira Sone Miku Tashiro Aaron Wolf Tsukasa Yoshida | Judo | Mixed team | 31 July |
| Silver | Kenichiro Fumita | Wrestling | Men's Greco-Roman 60 kg | 2 August |
| Silver | Kokona Hiraki | Skateboarding | Women's park | 4 August |
| Silver | Koki Ikeda | Athletics | Men's 20 kilometres walk | 5 August |
| Silver | Kiyou Shimizu | Karate | Women's kata | 5 August |
| Silver | Miu Hirano Kasumi Ishikawa Mima Ito | Table tennis | Women's team | 5 August |
| Silver | Miho Nonaka | Sport climbing | Women's combined | 6 August |
| Silver | Mone Inami | Golf | Women's individual | 7 August |
| Silver | Moeko Nagaoka Maki Takada Naho Miyoshi Rui Machida Nako Motohashi Nanaka Todo Saki Hayashi Evelyn Mawuli Saori Miyazaki Yuki Miyazawa Himawari Akaho Monica Okoye | Basketball | Women's tournament | 8 August |
| Silver | Yumi Kajihara | Cycling | Women's omnium | 8 August |
| Bronze | Funa Nakayama | Skateboarding | Women's street | 26 July |
| Bronze | Takaharu Furukawa Hiroki Muto Yuki Kawata | Archery | Men's team | 26 July |
| Bronze | Tsukasa Yoshida | Judo | Women's 57 kg | 26 July |
| Bronze | Amuro Tsuzuki | Surfing | Women's shortboard | 27 July |
| Bronze | Mikiko Andoh | Weightlifting | Women's 59 kg | 27 July |
| Bronze | Mima Ito | Table tennis | Women's singles | 29 July |
| Bronze | Yuta Watanabe Arisa Higashino | Badminton | Mixed doubles | 30 July |
| Bronze | Takaharu Furukawa | Archery | Men's individual | 31 July |
| Bronze | Kazuma Kaya | Gymnastics | Men's pommel horse | 1 August |
| Bronze | Mai Murakami | Gymnastics | Women's floor | 2 August |
| Bronze | Shohei Yabiku | Wrestling | Men's Greco-Roman 77 kg | 3 August |
| Bronze | Tsukimi Namiki | Boxing | Women's flyweight | 4 August |
| Bronze | Ryomei Tanaka | Boxing | Men's flyweight | 5 August |
| Bronze | Toshikazu Yamanishi | Athletics | Men's 20 kilometres walk | 5 August |
| Bronze | Jun Mizutani Koki Niwa Tomokazu Harimoto | Table tennis | Men's team | 6 August |
| Bronze | Akiyo Noguchi | Sport climbing | Women's combined | 6 August |
| Bronze | Ryutaro Araga | Karate | Men's +75 kg | 7 August |
Medals by sport :
| Sport | | | | Total |
| Judo | 9 | 2 | 1 | 12 |
| Wrestling | 5 | 1 | 1 | 7 |
| Skateboarding | 3 | 1 | 1 | 5 |
| Gymnastics | 2 | 1 | 2 | 5 |
| Swimming | 2 | 1 | 0 | 3 |
| Table tennis | 1 | 1 | 2 | 4 |
| Karate | 1 | 1 | 1 | 3 |
| Boxing | 1 | 0 | 2 | 3 |
| Baseball | 1 | 0 | 0 | 1 |
| Fencing | 1 | 0 | 0 | 1 |
| Softball | 1 | 0 | 0 | 1 |
| Athletics | 0 | 1 | 1 | 2 |
| Sport climbing | 0 | 1 | 1 | 2 |
| Surfing | 0 | 1 | 1 | 2 |
| Basketball | 0 | 1 | 0 | 1 |
| Cycling | 0 | 1 | 0 | 1 |
| Golf | 0 | 1 | 0 | 1 |
| Archery | 0 | 0 | 2 | 2 |
| Badminton | 0 | 0 | 1 | 1 |
| Weightlifting | 0 | 0 | 1 | 1 |
| Total | 27 | 14 | 17 | 58 |
Medals by day :
| Day | | | | Total |
| July 24 | 1 | 1 | 0 | 2 |
| July 25 | 4 | 0 | 0 | 4 |
| July 26 | 3 | 1 | 3 | 7 |
| July 27 | 2 | 1 | 2 | 5 |
| July 28 | 3 | 1 | 0 | 4 |
| July 29 | 2 | 0 | 1 | 3 |
| July 30 | 2 | 0 | 1 | 3 |
| July 31 | 0 | 1 | 1 | 2 |
| August 1 | 0 | 0 | 1 | 1 |
| August 2 | 0 | 1 | 1 | 2 |
| August 3 | 2 | 0 | 1 | 3 |
| August 4 | 2 | 1 | 1 | 4 |
| August 5 | 1 | 3 | 2 | 6 |
| August 6 | 2 | 1 | 2 | 5 |
| August 7 | 3 | 1 | 1 | 5 |
| August 8 | 0 | 2 | 0 | 2 |
| Total | 27 | 14 | 17 | 58 |
Medals by gender :
| Gender | | | | Total |
| Female | 14 | 8 | 8 | 30 |
| Male | 12 | 5 | 8 | 25 |
| Mixed | 1 | 1 | 1 | 3 |
| Total | 27 | 14 | 17 | 58 |

## Competitors

The following is the list of number of competitors in the Games. Note that reserves in field hockey, football, and handball are not counted:
| Sport | Men | Women | Total |
| Archery | 3 | 3 | 6 |
| Artistic swimming | — | 9 | 9 |
| Athletics | 41 | 9 | 50 |
| Badminton | 6 | 7 | 13 |
| Baseball | 24 | — | 24 |
| Basketball | 12 | 16 | 28 |
| Boxing | 4 | 2 | 6 |
| Canoeing | 7 | 5 | 12 |
| Cycling | 6 | 7 | 13 |
| Diving | 4 | 4 | 8 |
| Equestrian | 9 | 0 | 9 |
| Fencing | 12 | 9 | 21 |
| Field hockey | 16 | 16 | 32 |
| Football | 18 | 18 | 36 |
| Golf | 2 | 2 | 4 |
| Gymnastics | 5 | 12 | 17 |
| Handball | 14 | 14 | 28 |
| Judo | 7 | 7 | 14 |
| Karate | 4 | 4 | 8 |
| Modern pentathlon | 1 | 2 | 3 |
| Rugby sevens | 12 | 12 | 24 |
| Sailing | 8 | 7 | 15 |
| Shooting | 6 | 6 | 12 |
| Skateboarding | 4 | 6 | 10 |
| Softball | — | 15 | 15 |
| Sport climbing | 2 | 2 | 4 |
| Surfing | 2 | 2 | 4 |
| Swimming | 18 | 17 | 35 |
| Table tennis | 3 | 3 | 6 |
| Taekwondo | 2 | 2 | 4 |
| Tennis | 4 | 5 | 9 |
| Triathlon | 2 | 2 | 4 |
| Volleyball | 14 | 14 | 28 |
| Water polo | 13 | 13 | 26 |
| Weightlifting | 4 | 3 | 7 |
| Wrestling | 6 | 6 | 12 |
| Total | 295 | 261 | 556 |

## Archery

Japan fielded six archers (three men and three women) at the Games, as the host nation is automatically entitled to use the men's and women's team quota places.
The host nation's archery team was officially announced on March 21, 2021, with London 2012 silver medalist Takaharu Furukawa slated to shoot at his fifth consecutive Olympics.

### Men

| Athlete | Event | Ranking round | Ranking round | Round of 64 | Round of 32 | Round of 16 | Quarterfinals | Semifinals | Final / BM | Final / BM |
| Athlete | Event | Score | Seed | Opposition Score | Opposition Score | Opposition Score | Opposition Score | Opposition Score | Opposition Score | Rank |
| Takaharu Furukawa | Individual | 649 | 46 | Álvarez (MEX) W 7–3 | Broeksma (NED) W 6–5 | Das (IND) W 3–1 | Lia Jl (CHN) W 4–0 | Gazoz (TUR) L 1–4 | Tang C-c (TPE) W 4–1 | |
| Yuki Kawata | Individual | 661 | 22 | de Smedt (BEL) L 2–6 | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance |
| Hiroki Muto | Individual | 678 | 5 | Shanny (ISR) L 3–7 | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance |
| Takaharu Furukawa Yuki Kawata Hiroki Muto | Team | 1988 | 4 | — | — | Bye | United States (USA) W 5–1 | South Korea (KOR) L 4–5 | Netherlands (NED) W 5–4 | |

### Wonem

| Athlete | Event | Ranking round | Ranking round | Round of 64 | Round of 32 | Round of 16 | Quarterfinals | Semifinals | Final / BM | Final / BM |
| Athlete | Event | Score | Seed | Opposition Score | Opposition Score | Opposition Score | Opposition Score | Opposition Score | Opposition Score | Rank |
| Ren Hayakawa | Individual | 653 | 16 | Đỗ (VIE) W 6–5 | Kaufhold (USA) W 6–2 | An S (KOR) L 4–6 | Did not advance | Did not advance | Did not advance | Did not advance |
| Miki Nakamura | Individual | 639 | 31 | Horáčková (CZE) W 6–2 | Jang M-h (KOR) W 6–2 | Wu Jx (CHN) L 1–7 | Did not advance | Did not advance | Did not advance | Did not advance |
| Azusa Yamauchi | Individual | 665 | 7 | Bishindeeg (MGL) W 6–2 | Marusava (BLR) L 0–6 | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance |
| Ren Hayakawa Miki Nakamura Azusa Yamauchi | Team | 1957 | 4 | — | — | Bye | Belarus (BLR) L 3–5 | Did not advance | Did not advance | Did not advance |

### Mixed

| Athlete | Event | Ranking round | Ranking round | Round of 16 | Quarterfinals | Semifinals | Final / BM | Final / BM |
| Athlete | Event | Score | Seed | Opposition Score | Opposition Score | Opposition Score | Opposition Score | Rank |
| Hiroki Muto Azusa Yamauchi | Team | 1343 | 3 Q | France (FRA) L 3–5 | Did not advance | Did not advance | Did not advance | Did not advance |

## Artistic swimming

Japan as the host nation, entered a squad of eight artistic swimmers to compete in the women's duet and team event.
| Athlete | Event | Technical routine | Technical routine | Free routine (preliminary) | Free routine (preliminary) | Free routine (preliminary) | Free routine (final) | Free routine (final) | Free routine (final) |
| Athlete | Event | Points | Rank | Points | Total (technical + free) | Rank | Points | Total (technical + free) | Rank |
| Yukiko Inui Megumu Yoshida | Duet | 93.3499 | 4 | 93.9333 | 187.2832 | 4 Q | 94.4667 | 187.8166 | 4 |
| Juka Fukumura Yukiko Inui Moeka Kijima Okina Kyogoku Mayu Tsukamoto Mashiro Yasunaga Akane Yanagisawa Megumu Yoshida | Team | 93.3773 | 4 | — | — | — | 94.9333 | 188.3106 | 4 |

## Athletics (track and field)

Japanese athletes further achieved the entry standards, either by qualifying time or by world ranking, in the following track and field events (up to a maximum of 3 athletes in each event): The team will be selected based on the results of the 2020 Japan Championships and once an athlete wins a medal in race walking and marathon, or attains the top eight position in track and field at the 2019 IAAF World Championships in Doha, Qatar.
Four marathon runners (two per gender) were the first set of Japanese track and field athletes being selected for the Games, with a top-two finish of their respective races at the Grand Championship in Tokyo on September 15, 2019. By winning the gold medals at the World Championships, race walkers Toshikazu Yamanishi and London 2012 Olympian Yusuke Suzuki were officially added to the track and field roster. Suguru Osako and Mao Ichiyama completed the nation's marathon team lineup at the Nagoya and Lake Biwa Marathon on March 8, 2020.
Key
* Note–Ranks given for track events are within the athlete's heat only
* Q = Qualified for the next round
* q = Qualified for the next round as a fastest loser or, in field events, by position without achieving the qualifying target
* NR = National record
* N/A = Round not applicable for the event
* Bye = Athlete not required to compete in round

### Track & road events
#### Men

| Athlete | Event | Heat | Heat | Quarterfinal | Quarterfinal | Semifinal | Semifinal | Final | Final |
| Athlete | Event | Result | Rank | Result | Rank | Result | Rank | Result | Rank |
| Yuki Koike | 100 m | Bye | Bye | 10.22 | 4 | Did not advance | Did not advance | Did not advance | Did not advance |
| Shuhei Tada | 100 m | Bye | Bye | 10.22 | 6 | Did not advance | Did not advance | Did not advance | Did not advance |
| Ryota Yamagata | 100 m | Bye | Bye | 10.15 | 4 | Did not advance | Did not advance | Did not advance | Did not advance |
| Abdul Hakim Sani Brown | 200 m | 21.41 | 6 | — | — | Did not advance | Did not advance | Did not advance | Did not advance |
| Shota Iizuka | 200 m | 21.02 | 6 | — | — | Did not advance | Did not advance | Did not advance | Did not advance |
| Jun Yamashita | 200 m | 20.78 | 5 | — | — | Did not advance | Did not advance | Did not advance | Did not advance |
| Julian Walsh | 400 m | 46.57 | 6 | — | — | Did not advance | Did not advance | Did not advance | Did not advance |
| Yuta Bando | 5000 m | 14:05.80 | 17 | — | — | — | — | Did not advance | Did not advance |
| Hiroki Matsueda | 5000 m | 14:15.54 | 18 | — | — | — | — | Did not advance | Did not advance |
| Akira Aizawa | 10000 m | — | — | — | — | — | — | 28:18.37 | 17 |
| Tatsuhiko Ito | 10000 m | — | — | — | — | — | — | 29:01.31 | 22 |
| Shunsuke Izumiya | 110 m hurdles | 13.28 | 2 Q | — | — | 13.35 | 3 | Did not advance | Did not advance |
| Taio Kanai | 110 m hurdles | 13.41 | 3 Q | — | — | 26.11 | 8 | Did not advance | Did not advance |
| Shunya Takayama | 110 m hurdles | 13.98 | 6 | — | — | Did not advance | Did not advance | Did not advance | Did not advance |
| Takatoshi Abe | 400 m hurdles | 49.98 | 6 | — | — | Did not advance | Did not advance | Did not advance | Did not advance |
| Kazuki Kurokawa | 400 m hurdles | 50.30 | 6 | — | — | Did not advance | Did not advance | Did not advance | Did not advance |
| Hiromu Yamauchi | 400 m hurdles | 49.21 | 3 Q | — | — | 49.35 | 6 | Did not advance | Did not advance |
| Ryoma Aoki | 3000 m steeplechase | 8:24.82 | 9 | — | — | — | — | Did not advance | Did not advance |
| Ryuji Miura | 3000 m steeplechase | 8:09.92 | 2 Q | — | — | — | — | 8:16.90 | 7 |
| Kosei Yamaguchi | 3000 m steeplechase | 8:31.27 | 12 | — | — | — | — | Did not advance | Did not advance |
| Bruno Dede* Yoshihide Kiryu Yuki Koike Shuhei Tada Ryota Yamagata | 4 × 100 m relay | 38.16 | 3 Q | — | — | — | — | DNF | DNF |
| Rikuya Itō Kaito Kawabata Kentarō Satō Aoto Suzuki Julian Walsh* | 4 × 400 m relay | 3:00.76 | 5 | — | — | — | — | Did not advance | Did not advance |
| Yuma Hattori | Marathon | — | — | — | — | — | — | 2:30:08 | 73 |
| Shogo Nakamura | Marathon | — | — | — | — | — | — | 2:22:23 | 62 |
| Suguru Osako | Marathon | — | — | — | — | — | — | 2:10:41 | 6 |
| Koki Ikeda | 20 km walk | — | — | — | — | — | — | 1:12:14 | |
| Eiki Takahashi | 20 km walk | — | — | — | — | — | — | 1:27:29 | 32 |
| Toshikazu Yamanishi | 20 km walk | — | — | — | — | — | — | 1:12:28 | |
| Hayato Katsuki | 50 km walk | — | — | — | — | — | — | 4:06:32 | 30 |
| Masatora Kawano | 50 km walk | — | — | — | — | — | — | 3:51:56 | 6 |
| Satoshi Maruo | 50 km walk | — | — | — | — | — | — | 4:06:44 | 32 |

#### Women

| Athlete | Event | Heat | Heat | Semifinal | Semifinal | Final | Final |
| Athlete | Event | Result | Rank | Result | Rank | Result | Rank |
| Ran Urabe | 1500 m | 4:07.90 | 9 | Did not advance | Did not advance | Did not advance | Did not advance |
| Nozomi Tanaka | 1500 m | 4:02.33 NR | 4 Q | 3:59.19 NR | 5 Q | 3:59.95 | 8 |
| Kaede Hagitani | 5000 m | 15:04.95 | 12 | — | — | Did not advance | Did not advance |
| Ririka Hironaka | 5000 m | 14:55.87 | 9 q | — | — | 14:52.84 NR | 9 |
| Nozomi Tanaka | 5000 m | 14:59.93 | =6 | — | — | Did not advance | Did not advance |
| Yuka Ando | 10000 m | — | — | — | — | 32:40.77 | 23 |
| Ririka Hironaka | 10000 m | — | — | — | — | 31:00.71 PB | 7 |
| Hitomi Niiya | 10000 m | — | — | — | — | 32:23.87 SB | 22 |
| Masumi Aoki | 100 m hurdles | 13.59 | 7 | Did not advance | Did not advance | Did not advance | Did not advance |
| Ayako Kimura | 100 m hurdles | 13.25 | 7 | Did not advance | Did not advance | Did not advance | Did not advance |
| Asuka Terada | 100 m hurdles | 12.95 | 5 q | 13.06 | 6 | Did not advance | Did not advance |
| Yuno Yamanaka | 3000 m steeplechase | 9:43.83 | 10 | — | — | Did not advance | Did not advance | Did not advance |
| Hanae Aoyama Yu Ishikawa* Mei Kodama Remi Tsuruta Ami Saitō | 4 × 100 m relay | 43.44 | 7 | — | — | Did not advance | Did not advance |
| Mao Ichiyama | Marathon | — | — | — | — | 2:30:13 | 8 |
| Honami Maeda | Marathon | — | — | — | — | 2:35:28 | 33 |
| Ayuko Suzuki | Marathon | — | — | — | — | 2:33:14 | 19 |
| Nanako Fujii | 20 km walk | — | — | — | — | 1:31:55 | 13 |
| Kumiko Okada | 20 km walk | — | — | — | — | 1:31:57 | 15 |

### Field events
#### Men

| Athlete | Event | Qualification | Qualification | Final | Final |
| Athlete | Event | Distance | Position | Distance | Position |
| Yuki Hashioka | Long jump | 8.17 | 3 Q | 8.10 | 6 |
| Shotaro Shiroyama | Long jump | 7.70 | 23 | Did not advance | Did not advance |
| Hibiki Tsuha | Long jump | 7.61 | 26 | Did not advance | Did not advance |
| Takashi Eto | High jump | 2.21 | =17 | Did not advance | Did not advance |
| Naoto Tobe | High jump | 2.28 | =4 q | 2.24 | 13 |
| Masaki Ejima | Pole vault | 5.30 | =25 | Did not advance | Did not advance |
| Seito Yamamoto | Pole vault | 5.30 | =25 | Did not advance | Did not advance |
| Takuto Kominami | Javelin throw | 78.39 | 19 | Did not advance | Did not advance |

#### Women

| Athlete | Event | Qualification | Qualification | Final | Final |
| Athlete | Event | Distance | Position | Distance | Position |
| Haruka Kitaguchi | Javelin throw | 62.06 | 6 q | 55.42 | 12 |

## Badminton

Japan as the host nation, entered thirteen badminton players for each of the following events into the Olympic tournament based on the BWF Race to Tokyo Rankings. The team was announced by the Nippon Badminton Association on 18 June 2021.

### Men

| Athlete | Event | Group stage | Group stage | Group stage | Group stage | Elimination | Quarter-finals | Semi-finals | Final / BM | Final / BM |
| Athlete | Event | Opposition Score | Opposition Score | Opposition Score | Rank | Opposition Score | Opposition Score | Opposition Score | Opposition Score | Rank |
| Kento Momota | Singles | Lam (USA) W (21–12, 21–9) | Heo K-h (KOR) L (15–21, 19–21) | — | 2 | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance |
| Kanta Tsuneyama | Singles | Paul (MRI) W (21–8, 21–6) | Coelho (BRA) W (21–14, 21–8) | — | 1 Q | Ginting (INA) L (18–21, 14–21) | Did not advance | Did not advance | Did not advance | Did not advance |
| Hiroyuki Endo Yuta Watanabe | Doubles | Olofua / Opeyori (NGR) W (21–2, 21–7) | Ivanov / Sozonov (ROC) W (21–19, 21–19) | Astrup / Rasmussen (DEN) W (21–14, 21–12) | 1 Q | — | Lee Y / Wang C-l (TPE) L (16–21, 19–21) | Did not advance | Did not advance | Did not advance |
| Takeshi Kamura Keigo Sonoda | Doubles | Lamsfuß / Seidel (GER) W (21–13, 21–8) | P Chew / R Chew (USA) W (21–11, 21–3) | Li Jh / Liu Yc (CHN) L (14–21, 16–21) | 2 Q | — | Ahsan / Setiawan (INA) L (14–21, 21–16, 9–21) | Did not advance | Did not advance | Did not advance |

### Women

| Athlete | Event | Group stage | Group stage | Group stage | Group stage | Elimination | Quarterfinals | Semifinals | Final / BM | Final / BM |
| Athlete | Event | Opposition Score | Opposition Score | Opposition Score | Rank | Opposition Score | Opposition Score | Opposition Score | Opposition Score | Rank |
| Akane Yamaguchi | Singles | Shahzad (PAK) W (21–3, 21–8) | Gilmour (GBR) W (21–9, 21–18) | — | 1 Q | Kim G-e (KOR) W (21–17, 21–18) | Sindhu (IND) L (13–21, 20–22) | Did not advance | Did not advance | Did not advance |
| Nozomi Okuhara | Singles | Li (GER) W (21–17, 21–4) | Kosetskaya (ROC) W (21–6, 21–16) | — | 1 Q | Li (CAN) W (21–9, 21–7) | He Bj (CHN) L (21–13, 13–21, 14–21) | Did not advance | Did not advance | Did not advance |
| Yuki Fukushima Sayaka Hirota | Doubles | Birch / Smith (GBR) W (21–13, 21–14) | Chow M K / Lee M Y (MAS) W (17–21, 21–15, 21–8) | Polii / Rahayu (INA) L (22–24, 21–13, 8–21) | 2 Q | — | Chen Qc / Jia Yf (CHN) L (21–18, 10–21, 10–21) | Did not advance | Did not advance | Did not advance |
| Mayu Matsumoto Wakana Nagahara | Doubles | Hany / Hosny (EGY) W (21–7, 21–3) | Honderich / Tsai (CAN) W (14–21, 21–19, 21–18) | Piek / Seinen (NED) W (24–22, 21–15) | 1 Q | — | Kim S-y / Kong H-y (KOR) L (14–21, 21–14, 26–28) | Did not advance | Did not advance | Did not advance |

### Mixed

| Athlete | Event | Group stage | Group stage | Group stage | Group stage | Quarterfinals | Semifinals | Final / BM | Final / BM |
| Athlete | Event | Opposition Score | Opposition Score | Opposition Score | Rank= | Opposition Score | Opposition Score | Opposition Score | Rank |
| Yuta Watanabe Arisa Higashino | Doubles | Christiansen / Bøje (DEN) W (20–22, 21–11, 21–15) | Leung / Somerville (AUS) W (21–7, 21–15) | Jordan / Oktavianti (INA) W (21–13, 21–10) | 1 Q | Puavaranukroh / Taerattanachai (THA) W (15–21, 21–16, 21–14) | Wang / Huang (CHN) L (23–21, 15–21, 14–21) | Tang C M / Tse Y S (HKG) W (21–17, 23–21) | |

## Baseball

Japan national baseball team automatically qualified for the Olympics as the host nation.
Team roster
The final roster was announced on 16 June 2021.
Group play
| Pos | Teamvte | Pld | W | L | RF | RA | RD | PCT | GB | Qualification |
| 1 | Japan (H) | 2 | 2 | 0 | 11 | 7 | +4 | 1.000 | — | Round 2 |
| 2 | Dominican Republic | 2 | 1 | 1 | 4 | 4 | 0 | .500 | 1 | Round 1 game #2 |
| 3 | Mexico | 2 | 0 | 2 | 4 | 8 | −4 | .000 | 2 | Round 1 game #1 |
28 July 12:00 (JST) Fukushima Azuma Baseball Stadium :
| Team | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | R | H | E |
| Dominican Republic | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 1 | 3 | 8 | 0 |
| Japan | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 3 | 4 | 9 | 0 |
| WP: Ryoji Kuribayashi (1–0) LP: Jairo Asencio (0–1) Boxscore |||||||||||||
31 July 12:00 Yokohama Stadium :
| Team | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | R | H | E |
| Japan | 0 | 1 | 1 | 3 | 0 | 0 | 1 | 1 | 0 | 7 | 10 | 0 |
| Mexico | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 2 | 0 | 4 | 7 | 2 |
| WP: Masato Morishita (1–0) LP: Juan Pablo Oramas (0–1) Sv: Ryoji Kuribayashi (1) Home runs: JPN: Tetsuto Yamada (1), Hayato Sakamoto (1) MEX: Joey Meneses (1) Boxscore |||||||||||||
Round 2
2 August 19:00 Yokohama Stadium :
| Team | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | R | H | E |
| United States | 0 | 0 | 0 | 3 | 3 | 0 | 0 | 0 | 0 | 0 | 6 | 12 | 2 |
| Japan (10) | 0 | 0 | 2 | 1 | 2 | 0 | 0 | 0 | 1 | 1 | 7 | 12 | 0 |
| WP: Ryoji Kuribayashi (2–0) LP: Edwin Jackson (0–1) Home runs: USA: Triston Casas (2) JPN: Seiya Suzuki (1) Boxscore ||||||||||||||
Semifinal
4 August 19:00 Yokohama Stadium :
| Team | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | R | H | E |
| South Korea | 0 | 0 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 2 | 7 | 1 |
| Japan | 0 | 0 | 1 | 0 | 1 | 0 | 0 | 3 | X | 5 | 9 | 1 |
| WP: Hiromi Itoh (1–0) LP: Go Woo-suk (0–1) Sv: Ryoji Kuribayashi (2) Boxscore |||||||||||||
Gold medal game
7 August 19:00 Yokohama Stadium :
| Team | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | R | H | E |
| United States | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6 | 1 |
| Japan | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 1 | X | 2 | 8 | 0 |
| WP: Masato Morishita (2–0) LP: Nick Martinez (1–1) Sv: Ryoji Kuribayashi (3) Home runs: USA: None JPN: Munetaka Murakami (1) Boxscore |||||||||||||

## Basketball
### Indoor
#### Men's tournament

Japan men's basketball team automatically qualified for the Olympics as the host nation.
Team roster
The roster was announced on 5 July 2021.
Group play
| Pos | Teamvte | Pld | W | L | PF | PA | PD | Pts | Qualification |
| 1 | Slovenia | 3 | 3 | 0 | 329 | 268 | +61 | 6 | Quarterfinals |
| 2 | Spain | 3 | 2 | 1 | 256 | 243 | +13 | 5 | Quarterfinals |
| 3 | Argentina | 3 | 1 | 2 | 268 | 276 | −8 | 4 | Quarterfinals |
| 4 | Japan (H) | 3 | 0 | 3 | 235 | 301 | −66 | 3 | |
* 26 July 2021 (2021-07-26) 21:00 v
* Boxscore
| Japan | 77–88 | Spain |
| Scoring by quarter: 14–18, 14–30, 28–21, 21–19 |||
| Pts: Hachimura 20 Rebs: Watanabe 8 Asts: Baba, Tanaka 5 | | Pts: Rubio 20 Rebs: Claver 9 Asts: Rubio 9 |
* Saitama Super Arena, Saitama Referees: Aleksandar Glišić (SRB), Mārtiņš Kozlovskis (LAT), Rabah Noujaim (LIB)
* 29 July 2021 (2021-07-29) 13:40 v
* Boxscore
| Slovenia | 116–81 | Japan |
| Scoring by quarter: 29–23, 24–18, 27–23, 36–17 |||
| Pts: Dončić 25 Rebs: Tobey 11 Asts: Dončić 7 | | Pts: Hachimura 34 Rebs: Hachimura, Watanabe 7 Asts: Hachimura, Tanaka 3 |
* Saitama Super Arena, Saitama Referees: Aleksandar Glišić (SRB), Michael Weiland (CAN), Ferdinand Pascual (PHI)
* 1 August 2021 (2021-08-01) 13:40 v
* Boxscore
| Argentina | 97–77 | Japan |
| Scoring by quarter: 26–16, 20–22, 19–15, 32–24 |||
| Pts: Scola 23 Rebs: Scola 10 Asts: Campazzo 11 | | Pts: Baba 18 Rebs: Hachimura 11 Asts: three players 3 |
* Saitama Super Arena, Saitama Referees: Roberto Vázquez (PUR), Mārtiņš Kozlovskis (LAT), Michael Weiland (CAN)

#### Women's tournament

Japan women's basketball team automatically qualified for the Olympics as the host nation.
Team roster
The roster was announced on 1 July 2021.
Group play
| Pos | Teamvte | Pld | W | L | PF | PA | PD | Pts | Qualification |
| 1 | United States | 3 | 3 | 0 | 260 | 223 | +37 | 6 | Quarterfinals |
| 2 | Japan (H) | 3 | 2 | 1 | 245 | 239 | +6 | 5 | Quarterfinals |
| 3 | France | 3 | 1 | 2 | 239 | 229 | +10 | 4 | Quarterfinals |
| 4 | Nigeria | 3 | 0 | 3 | 217 | 270 | −53 | 3 | |
* 27 July 2021 (2021-07-27) 10:00 v
* Boxscore
| Japan | 74–70 | France |
| Scoring by quarter: 13–17, 21–19, 18–13, 22–21 |||
| Pts: Hayashi 12 Rebs: Akaho 9 Asts: Machida 11 | | Pts: Gruda 18 Rebs: Gruda 9 Asts: Johannès 4 |
* Saitama Super Arena, Saitama Referees: Maripier Malo (CAN), James Boyer (AUS), Yevgeniy Mikheyev (KAZ)
* 30 July 2021 (2021-07-30) 13:40 v
* Boxscore
| United States | 86–69 | Japan |
| Scoring by quarter: 28–30, 21–10, 16–13, 21–16 |||
| Pts: Wilson 20 Rebs: Stewart 13 Asts: Bird, Stewart 6 | | Pts: Takada 15 Rebs: Akaho 8 Asts: Machida 11 |
* Saitama Super Arena, Saitama Referees: Yener Yılmaz (TUR), Yevgeniy Mikheyev (KAZ), Gizella Györgyi (NOR)
* 2 August 2021 (2021-08-02) 10:00 v
* Boxscore
| Nigeria | 83–102 | Japan |
| Scoring by quarter: 22–30, 16–21, 19–33, 26–18 |||
| Pts: Macaulay 18 Rebs: Chidom, Elonu 7 Asts: Nyingifa 8 | | Pts: Hayashi 23 Rebs: Akaho 7 Asts: Machida 15 |
* Saitama Super Arena, Saitama Referees: Juan Fernández (ARG), Andreia Silva (BRA), Yevgeniy Mikheyev (KAZ)
Quarterfinal
* 4 August 2021 (2021-08-04) 17:20 v
* Boxscore
| Japan | 86–85 | Belgium |
| Scoring by quarter: 19–16, 22–26, 20–26, 25–17 |||
| Pts: Miyazawa 21 Rebs: Akaho 7 Asts: Machida 14 | | Pts: Meesseman 25 Rebs: Meesseman 11 Asts: Allemand 8 |
* Saitama Super Arena, Saitama Referees: Yu Jung (TPE), Amy Bonner (USA), James Boyer (AUS)
Semifinal
* 6 August 2021 (2021-08-06) 20:00 v
* Boxscore
| Japan | 87–71 | France |
| Scoring by quarter: 14–22, 27–12, 27–16, 19–21 |||
| Pts: Akaho 17 Rebs: Akaho, Miyazawa 7 Asts: Machida 18 | | Pts: Gruda 18 Rebs: Williams 8 Asts: Williams 7 |
* Saitama Super Arena, Saitama Referees: Maripier Malo (CAN), Luis Castillo (ESP), Yevgeniy Mikheyev (KAZ)
Final
* 8 August 2021 (2021-08-08) 11:30 v
* Boxscore
| United States | 90–75 | Japan |
| Scoring by quarter: 23–14, 27–25, 25–17, 15–19 |||
| Pts: Griner 30 Rebs: Stewart 14 Asts: Taurasi 8 | | Pts: Takada 17 Rebs: Okoye 8 Asts: Machida 6 |
* Saitama Super Arena, Saitama Referees: Manuel Mazzoni (ITA), Andreia Silva (BRA), Maripier Malo (CAN)

### 3×3 basketball

Summary
| Team | Event | Group stage | Group stage | Group stage | Group stage | Group stage | Group stage | Group stage | Group stage | Quarter-finals | Semi-finals | GM / BM | Rank |
| Team | Event | Opposition Score | Opposition Score | Opposition Score | Opposition Score | Opposition Score | Opposition Score | Opposition Score | Rank | Opposition Score | Opposition Score | Opposition Score | Rank |
| Japan men's 3×3 | Men's 3×3 tournament | Poland L 19–20 | Belgium W 18–16 | Netherlands L 20–21 | Latvia L 18–21 | Serbia L 11–21 | ROC L 16–19 | China W 21–16 | 6 | Latvia L 18–21 | Did not advance | Did not advance | 6 |
| Japan women's 3×3 | Women's 3×3 tournament | ROC L18–21 | Romania W 20–8 | Mongolia W 19–10 | France W 19–15 | China L 12–15 | Italy W 22–10 | United States W 20–18 | 4 | France L 14–16 | Did not advance | Did not advance | 5 |

#### Men's tournament

Japan men's basketball 3x3 team automatically qualified for the Olympics as the host nation.
Team roster The players were announced on 3 July 2021.
* Ira Brown
* Tomoya Ochiai
* Keisei Tominaga
* Ryuto Yasuoka
Group play
| Pos | Teamvte | Pld | W | L | PF | PA | PD | Qualification |
| 1 | Serbia | 7 | 7 | 0 | 138 | 91 | +47 | Semifinals |
| 2 | Belgium | 7 | 4 | 3 | 126 | 127 | −1 | Semifinals |
| 3 | Latvia | 7 | 4 | 3 | 133 | 129 | +4 | Quarterfinals |
| 4 | Netherlands | 7 | 4 | 3 | 132 | 129 | +3 | Quarterfinals |
| 5 | ROC | 7 | 3 | 4 | 116 | 125 | −9 | Quarterfinals |
| 6 | Japan (H) | 7 | 2 | 5 | 123 | 134 | −11 | Quarterfinals |
| 7 | Poland | 7 | 2 | 5 | 120 | 130 | −10 | |
| 8 | China | 7 | 2 | 5 | 119 | 142 | −23 | |
* 1 2 3 Belgium 2–0, Latvia 1–1, Netherlands 0–2
* 1 2 3 Japan 1–1, 123 PS; Poland 1–1, 120 PS; China 1–1, 119 PS
* 24 July 2021 (2021-07-24) 19:05 v
* Report
| Japan | 19–20 (OT) | Poland |
| Pts: Brown, Tominaga 7 | | Pts: Pawłowski, Zamojski 7 |
* Aomi Urban Sports Park, Tokyo Referees: Vlad Ghizdareanu (ROU), Jasmina Juras (SRB)
* 24 July 2021 (2021-07-24) 22:25 v
* Report
| Belgium | 16–18 (OT) | Japan |
| Pts: Bogaerts 5 | | Pts: Yasuoka 7 |
* Aomi Urban Sports Park, Tokyo Referees: Vlad Ghizdareanu (ROU), Su Yu-yen (TPE)
* 25 July 2021 (2021-07-25) 19:05 v
* Report
| Japan | 20–21 | Netherlands |
| Pts: Tominaga 10 | | Pts: Bekkering, Slagter 6 |
* Aomi Urban Sports Park, Tokyo Referees: Marek Maliszewski (POL), Vanessa Devlin (AUS)
* 25 July 2021 (2021-07-25) 22:25 v
* Report
| Latvia | 21–18 | Japan |
| Pts: Lasmanis 7 | | Pts: Tominaga 9 |
* Aomi Urban Sports Park, Tokyo Referees: Edmond Ho (HKG), Marek Maliszewski (POL)
* 26 July 2021 (2021-07-26) 12:00 v
* Report
| Serbia | 21–11 | Japan |
| Pts: Domović Bulut 7 | | Pts: Yasuoka 8 |
* Aomi Urban Sports Park, Tokyo Referees: Edmond Ho (HKG), Glenn Tuitt (USA)
* 26 July 2021 (2021-07-26) 15:00 v
* Report
| Japan | 16–19 | ROC |
| Pts: Brown 7 | | Pts: Pisklov 7 |
* Aomi Urban Sports Park, Tokyo Referees: Glenn Tuitt (USA), Cecília Tóth (HUN)
* 27 July 2021 (2021-07-27) 15:05 v
* Report
| China | 16–21 | Japan |
| Pts: Gao 8 | | Pts: Tominaga, Yasuoka 8 |
* Aomi Urban Sports Park, Tokyo Referees: Markos Michaelides (SUI), Jasmina Juras (SRB)
Quarter-finals
* 27 July 2021 (2021-07-27) 22:20 v
* Report
| Latvia | 21–18 | Japan |
| Pts: Krūmiņš 9 | | Pts: Tominaga 8 |
* Aomi Urban Sports Park, Tokyo Referees: Jasmina Juras (SRB), Marek Maliszewski (POL)

#### Women's tournament

Japan women's national 3x3 team qualified for the Olympics by securing a top three finish at the 2021 Olympic Qualifying Tournament.
Team roster The players were announced on 3 July 2021.
* Stephanie Mawuli
* Risa Nishioka
* Mio Shinozaki
* Mai Yamamoto
Group play
| Pos | Teamvte | Pld | W | L | PF | PA | PD | Qualification |
| 1 | United States | 7 | 6 | 1 | 136 | 98 | +38 | Semifinals |
| 2 | ROC | 7 | 5 | 2 | 129 | 90 | +39 | Semifinals |
| 3 | China | 7 | 5 | 2 | 127 | 97 | +30 | Quarterfinals |
| 4 | Japan (H) | 7 | 5 | 2 | 130 | 97 | +33 | Quarterfinals |
| 5 | France | 7 | 4 | 3 | 118 | 116 | +2 | Quarterfinals |
| 6 | Italy | 7 | 2 | 5 | 98 | 125 | −27 | Quarterfinals |
| 7 | Romania | 7 | 1 | 6 | 89 | 142 | −53 | |
| 8 | Mongolia | 7 | 0 | 7 | 79 | 141 | −62 | |
* 1 2 3 ROC 2–0, China 1–1, Japan 0–2
* 24 July 2021 (2021-07-24) 10:15 v
* Report
| ROC | 21–18 | Japan |
| Pts: O. Frolkina 7 | | Pts: Shinozaki 8 |
* Aomi Urban Sports Park, Tokyo Referees: Edmond Ho (HKG), Cecília Tóth (HUN)
* 24 July 2021 (2021-07-24) 14:25 v
* Report
| Romania | 8–20 | Japan |
| Pts: Ursu-Kim 3 | | Pts: Mawuli 9 |
* Aomi Urban Sports Park, Tokyo Referees: Sara El-Sharnouby (EGY), Markos Michaelides (SUI)
* 25 July 2021 (2021-07-25) 10:15 v
* Report
| Japan | 19–10 | Mongolia |
| Pts: Mawuli, Yamamoto 6 | | Pts: Chimeddolgor, Solongo 3 |
* Aomi Urban Sports Park, Tokyo Referees: Shi Qirong (CHN), Markos Michaelides (SUI)
* 25 July 2021 (2021-07-25) 17:55 v
* Report
| Japan | 19–15 | France |
| Pts: three players 5 | | Pts: Paget 6 |
* Aomi Urban Sports Park, Tokyo Referees: Evgeny Ostrovskiy (RUS), Vanessa Devlin (AUS)
* 26 July 2021 (2021-07-26) 10:15 v
* Report
| Japan | 12–15 | China |
| Pts: Mawuli 5 | | Pts: Wang L. 5 |
* Aomi Urban Sports Park, Tokyo Referees: Marek Maliszewski (POL), Vanessa Devlin (AUS)
* 26 July 2021 (2021-07-26) 14:25 v
* Report
| Italy | 10–22 | Japan |
| Pts: Consolini 4 | | Pts: Mawuli 8 |
* Aomi Urban Sports Park, Tokyo Referees: Cecília Tóth (HUN), Su Yu-yen (TPE)
* 27 July 2021 (2021-07-27) 13:30 v
* Report
| United States | 18–20 | Japan |
| Pts: Dolson 7 | | Pts: Yamamoto 8 |
* Aomi Urban Sports Park, Tokyo Referees: Evgeny Ostrovskiy (RUS), Shi Qirong (CHN)
Quarterfinal
* 27 July 2021 (2021-07-27) 21:50 v
* Report
| Japan | 14–16 | France |
| Pts: Shinozaki 7 | | Pts: Paget 5 |
* Aomi Urban Sports Park, Tokyo Referees: Evgeny Ostrovskiy (RUS), Cecília Tóth (HUN)

## Boxing

Japan entered six boxers (four men and two women) into the Olympic tournament. Sewon Okazawa (men's welterweight), 2018 world bronze medalist Tsukimi Namiki (women's flyweight), and Sena Irie (women's featherweight) secured the spots on the host nation's squad in their respective weight divisions, either by advancing to the semifinal match or by scoring a box-off triumph, at the 2020 Asia & Oceania Qualification Tournament in Amman, Jordan. Three more boxers were officially selected by the Japanese Olympic Committee and the Japanese Boxing Federation to take up the host nation places for the Games, including Rio 2016 Olympian Daisuke Narimatsu in the men's lightweight division.
| Athlete | Event | Round of 32 | Round of 16 | Quarterfinals | Semifinals | Final | Final |
| Athlete | Event | Opposition Result | Opposition Result | Opposition Result | Opposition Result | Opposition Result | Rank |
| Ryomei Tanaka | Men's flyweight | Finol (VEN) W 5–0 | Hu Jg (CHN) W 3–1 | Martinez (COL) W 4–1 | Paalam (PHI) L 0–5 | Did not advance | |
| Daisuke Narimatsu | Men's lightweight | Pezo (PER) W 5–0 | Safiullin (KAZ) L WO | Did not advance | Did not advance | Did not advance | Did not advance |
| Sewon Okazawa | Men's welterweight | Yadav (IND) W 5–0 | Iglesias (CUB) L 2–3 | Did not advance | Did not advance | Did not advance | Did not advance |
| Yuito Moriwaki | Men's middleweight | Mousavi (IRI) W 3–2 | Khyzhniak (UKR) L 0–5 | Did not advance | Did not advance | Did not advance | Did not advance |
| Tsukimi Namiki | Women's flyweight | Nanziri (UGA) W 5–0 | Sousa (BRA) W 5–0 | Valencia (COL) W 5–0 | Krasteva (BUL) L 0–5 | Did not advance | |
| Sena Irie | Women's featherweight | Solorzano (ESA) W 5–0 | Hlimi (TUN) W 5–0 | Nechita (ROU) W 3–2 | Artingstall (GBR) W 3–2 | Petecio (PHI) W 5–0 | |

## Canoeing
### Slalom

Being the host nation, Japan has been awarded one boat each in all four classes. On October 20, 2019, the slalom canoeists were officially selected to the host nation's roster at the conclusion of the NHK Slalom International Cup, with Rio 2016 bronze medalist Takuya Haneda remarkably going to his fourth straight Olympics.
| Athlete | Event | Preliminary | Preliminary | Preliminary | Preliminary | Preliminary | Preliminary | Semifinals | Semifinals | Final | Final |
| Athlete | Event | Run 1 | Rank | Run 2 | Rank | Best | Rank | Time | Rank | Time | Rank |
| Takuya Haneda | Men's C-1 | 106.57 | 11 | 105.15 | 11 | 105.15 | 13 Q | 107.82 | 10 Q | 109.30 | 10 |
| Kazuya Adachi | Men's K-1 | 97.72 | 14 | 92.09 | 6 | 92.09 | 6 Q | 101.60 | 16 | Did not advance | Did not advance |
| Ayano Sato | Women's C-1 | 161.77 | 21 | 151.03 | 19 | 151.03 | 20 | Did not advance | Did not advance | Did not advance | Did not advance |
| Aki Yazawa | Women's K-1 | 129.87 | 21 | 127.91 | 21 | 127.91 | 22 Q | 124.73 | 19 | Did not advance | Did not advance |

### Sprint

Being the host nation, Japan has been awarded a minimum of three boats, with one each in the men's C-1 1000 m, women's C-1 200 m, and women's K-1 500 m. The men's K-4 500 m boat was added to the team roster with a top-ten finish at the 2019 ICF Canoe Sprint World Championships in Szeged, Hungary and the women's K-1 200 m with the fastest finish vying for qualification at the 2021 Asian Championships in Pattaya, Thailand. With the cancellation of the 2021 Pan American Championships and the lack of eligible competitors available from the Americas in the canoe sprint regatta, the women's C-2 500 m crew accepted a spare berth from the International Canoe Federation for the Japanese team.
| Athlete | Event | Heats | Heats | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Final | Final |
| Athlete | Event | Time | Rank | Time | Rank | Time | Rank | Time | Rank |
| Takanori Tōme | Men's C-1 1000 m | 4:37.208 | 7 QF | 4:38.546 | 6 | Did not advance | Did not advance | Did not advance | Did not advance |
| Hiroki Fujishima Yūsuke Miyata Momotaro Matsushita Keiji Mizumoto | Men's K-4 500 m | 1:32.295 | 6 QF | 1:28.211 | 7 | Did not advance | Did not advance | Did not advance | Did not advance |
| Teruko Kiriake Manaka Kubota | Women's C-2 500 m | 2:16.791 | 7 QF | 2:08.849 | 5 FB | Bye | Bye | 2:06.196 | 14 |
| Yuka Ono | Women's K-1 200 m | 45.251 | 7 QF | 45.610 | 7 | Did not advance | Did not advance | Did not advance | Did not advance |
Qualification Legend: FA = Qualify to final (medal); FB = Qualify to final B (non-medal)

## Cycling
### Road

Japan entered a squad of four riders (two per gender) to compete in their respective Olympic road races. Two of them filled out the places reserved for the host nation, while the remaining male and female rider earned a slot each by finishing in the top 50 (for men) and top 22 (for women) in the UCI World Ranking.
| Athlete | Event | Time | Rank |
| Yukiya Arashiro | Men's road race | 6:15:38 | 35 |
| Nariyuki Masuda | Men's road race | 6:25:16 | 84 |
| Hiromi Kaneko | Women's road race | 4:01:08 | 43 |
| Eri Yonamine | Women's road race | 3:55:13 | 21 |
| Eri Yonamine | Women's time trial | 34:34.97 | 22 |

### Track

Following the completion of the 2020 UCI Track Cycling World Championships, Japanese riders accumulated spots for both men and women in the sprint, keirin, and omnium, as well as the women's madison, based on their country's results in the final UCI Olympic rankings.
Topping the podium in the women's omnium at the 2020 Worlds, Yumi Kajihara became the first Japanese rider to guarantee a spot on the host nation's track cycling team for the Games. Five more members on the squad were named on June 4, 2020, with sprint riders Yudai Nitta (London 2012) and Yuta Wakimoto (Rio 2016) booking their spots for the second Olympics.
Sprint
| Athlete | Event | Qualification | Qualification | Round 1 | Repechage 1 | Round 2 | Repechage 2 | Round 3 | Repechage 3 | Quarterfinals | Semifinals | Final | Final |
| Athlete | Event | Time Speed (km/h) | Rank | Opposition Time Speed (km/h) | Opposition Time Speed (km/h) | Opposition Time Speed (km/h) | Opposition Time Speed (km/h) | Opposition Time Speed (km/h) | Opposition Time Speed (km/h) | Opposition Time Speed (km/h) | Opposition Time Speed (km/h) | Opposition Time Speed (km/h) | Rank |
| Yudai Nitta | Men's sprint | 9.728 74.013 | 26 | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance |
| Yuta Wakimoto | Men's sprint | 9.518 75.646 | 9 Q | Quintero (COL) W 9.997 72.022 | Bye | Kenny (GBR) L | Bötticher (GER) W 10.323 69.747 | Paul (TTO) L | Kenny (GBR) Awang (MAS) L | Did not advance | Did not advance | Did not advance | Did not advance |
| Yuka Kobayashi | Women's sprint | 10.711 67.221 | 17 Q | Marchant (GBR) L | Krupeckaitė (LTU) Marozaitė (LTU) W 11.335 63.520 | Gros (FRA) L | Voynova (ROC) L | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance |
Keirin
| Athlete | Event | Round 1 | Repechage | Quarterfinals | Semifinals | Final |
| Athlete | Event | Rank | Rank | Rank | Rank | Rank |
| Yudai Nitta | Men's keirin | 1 QF | Bye | 6 | Did not advance | Did not advance |
| Yuta Wakimoto | Men's keirin | 1 QF | Bye | 1 SF | 5 FB | 7 |
| Yuka Kobayashi | Women's keirin | 2 QF | Bye | 6 | Did not advance | Did not advance |
Omnium
| Athlete | Event | Scratch race | Scratch race | Tempo race | Tempo race | Elimination race | Elimination race | Points race | Points race | Total points | Rank |
| Athlete | Event | Rank | Points | Rank | Points | Rank | Points | Rank | Points | Total points | Rank |
| Eiya Hashimoto | Men's omnium | 8 | 26 | 16 | 10 | 12 | 18 | 15 | 0 | 54 | 15 |
| Yumi Kajihara | Women's omnium | 2 | 38 | 5 | 32 | 2 | 38 | 11 | 2 | 110 | |
Madison
| Athlete | Event | Points | Laps | Rank |
| Yumi Kajihara Kisato Nakamura | Women's madison | 0 | –40 | 13 |

### Mountain biking

As the host nation, Japanese mountain bikers have already received a quota place each per gender at their disposal for the Games. The mountain biking team was officially named to the host nation's roster on June 5, 2020, with Kohei Yamamoto booking his fourth consecutive trip to the Games on the men's side.
| Athlete | Event | Time | Rank |
| Kohei Yamamoto | Men's cross-country | 1:32:35 | 29 |
| Miho Imai | Women's cross-country | LAP (3 laps) | 37 |

### BMX

As the host nation, Japan has already received four quota places each per gender per event at their disposal for the Games.
Race
| Athlete | Event | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Final | Final |
| Athlete | Event | Points | Rank | Points | Rank | Result | Rank |
| Yoshitaku Nagasako | Men's race | 12 | 5 | Did not advance | Did not advance | Did not advance | Did not advance |
| Sae Hatakeyama | Women's race | 22 | 6 | Did not advance | Did not advance | Did not advance | Did not advance |
Freestyle
| Athlete | Event | Seeding | Seeding | Final | Final |
| Athlete | Event | Score | Rank | Score | Rank |
| Rim Nakamura | Men's freestyle | 87.67 | 2 | 85.10 | 5 |
| Minato Oike | Women's freestyle | 61.45 | 8 | 75.40 | 7 |

## Diving

Japan, as the host nation, is automatically entitled to places in all synchronized diving events, but athletes for individual events must qualify through their own performances at 2019 FINA World Championships, the 2019 Asian Cup, and the 2020 FINA World Cup series.
Five-time Olympian Ken Terauchi and his Rio 2016 partner Sho Sakai became the first Japanese divers to be selected to the squad after finishing seventh in the men's synchronized springboard at the 2019 FINA World Championships in Gwangju, South Korea.

### Men

| Athlete | Event | Preliminary | Preliminary | Semifinal | Semifinal | Final | Final |
| Athlete | Event | Points | Rank | Points | Rank | Points | Rank |
| Ken Terauchi | 3 m springboard | 430.20 | 10 Q | 424.50 | 7 Q | 359.70 | 12 |
| Reo Nishida | 10 m platform | 314.30 | 25 | Did not advance | Did not advance | Did not advance | Did not advance |
| Rikuto Tamai | 10 m platform | 374.25 | 16 Q | 413.65 | 8 Q | 431.95 | 7 |
| Sho Sakai Ken Terauchi | 3 m synchronized springboard | — | — | — | — | 393.93 | 5 |
| Hiroki Ito Kazuki Murakami | 10 m synchronized platform | — | — | — | — | 377.10 | 8 |

### Women

| Athlete | Event | Preliminary | Preliminary | Semifinal | Semifinal | Final | Final |
| Athlete | Event | Points | Rank | Points | Rank | Points | Rank |
| Haruka Enomoto | 3 m springboard | 277.85 | 17 Q | 255.40 | 17 | Did not advance | Did not advance |
| Sayaka Mikami | 3 m springboard | 317.10 | 5 Q | 273.70 | 16 | Did not advance | Did not advance |
| Matsuri Arai | 10 m platform | 268.80 | 22 | Did not advance | Did not advance | Did not advance | Did not advance |
| Haruka Enomoto Hazuki Miyamoto | 3 m synchronized springboard | — | — | — | — | 269.40 | 5 |
| Matsuri Arai Minami Itahashi | 10 m synchronized platform | — | — | — | — | 291.42 | 6 |

## Equestrian

Japan, as the host nation, automatically received a team of three riders in each of the three sporting disciplines: dressage, eventing, and jumping.

### Dressage

Masanao Takahashi and Rubicon have been named the traveling alternates.
| Athlete | Horse | Event | Grand Prix | Grand Prix | Grand Prix Special | Grand Prix Special | Grand Prix Freestyle | Grand Prix Freestyle | Overall | Overall |
| Athlete | Horse | Event | Score | Rank | Score | Rank | Technical | Artistic | Score | Rank |
| Shingo Hayashi | Scolari | Individual | 65.714 | 48 | — | — | Did not advance | Did not advance | Did not advance | Did not advance |
| Hiroyuki Kitahara | Huracan | Individual | 66.304 | 45 | — | — | Did not advance | Did not advance | Did not advance | Did not advance |
| Kazuki Sado | Ludwig der Sonnenkönig | Individual | 62.531 | 56 | — | — | Did not advance | Did not advance | Did not advance | Did not advance |
| Shingo Hayashi Hiroyuki Kitahara Kazuki Sado | See above | Team | 6264.5 | 14 | Did not advance | Did not advance | — | — | Did not advance | Did not advance |
Qualification Legend: Q = Qualified for the final; q = Qualified for the final as a lucky loser

### Eventing

Ryuzo Kitajima and Feroza Nieuwmoed have been named the reserves.
| Athlete | Horse | Event | Dressage | Dressage | Cross-country | Cross-country | Cross-country | Jumping | Jumping | Jumping | Jumping | Jumping | Jumping | Total | Total |
| Athlete | Horse | Event | Dressage | Dressage | Cross-country | Cross-country | Cross-country | Qualifier | Qualifier | Qualifier | Final | Final | Final | | | Total | Total |
| Athlete | Horse | Event | Penalties | Rank | Penalties | Total | Rank | Penalties | Total | Rank | Penalties | Total | Rank | Penalties | Rank |
| Yoshiaki Oiwa | Calle | Individual | 31.50 | 21 | Eliminated | Eliminated | Eliminated | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance |
| Toshiyuki Tanaka | Talma d'Allou | Individual | 32.70 | 29 | 30.80 | 63.50 | 35 | 12.00 | 75.50 | 34 | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance |
| Kazuma Tomoto | Vinci de la Vigne | Individual | 26.10 | 7 | 1.60 | 27.50 | 5 | 4.00 | 31.50 | 7 | 0.40 | 31.90 | 4 | 31.90 | 4 |
| Yoshiaki Oiwa Toshiyuki Tanaka Kazuma Tomoto Ryuzo Kitajima (s) | Calle Talma d'Allou Vinci de la Vigne Feroza Nieuwmoed | Team | 90.10 | 4 | 232.40 | 322.50 | 12 | 16.00+20.00 | 358.50 | 11 | — | — | — | 358.50 | 11 |
* (s) – substituted before jumping – 20 replacement penalties

### Jumping

Mike Kawai and As de Mai have been named the traveling alternates.
| Athlete | Horse | Event | Qualification | Qualification | Final | Final | Final | Jump-off | Jump-off | Jump-off |
| Athlete | Horse | Event | Penalties | Rank | Penalties | Time | Rank | Penalties | Time | Rank |
| Daisuke Fukushima | Canyon | Individual | 0 | =1 Q | 0 | 87.57 | =1 Q | 0 | 43.76 | 6 |
| Koki Saito | Chilensky | Individual | 0 | =1 Q | 5 | 89.82 | 13 | Did not advance | Did not advance | Did not advance |
| Eiken Sato | Saphyr des Lacs | Individual | 1 | =26 Q | 16 | 84.67 | 25 | Did not advance | Did not advance | Did not advance |
| Daisuke Fukushima Koki Saito Eiken Sato | See above | Team | Eliminated | Eliminated | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance |

## Fencing

Japanese fencers qualified a full squad in the women's team foil for the Games as the highest-ranked nation from Asia and Oceania outside the world's top four in the FIE Olympic Team Rankings. Rookies Masaru Yamada (men's épée), Takahiro Shikine (men's foil), Kento Yoshida (men's sabre), and Misaki Emura (women's sabre), with Nozomi Satō (women's épée) going to her third consecutive Games, secured additional places on the host nation's roster as one of the two highest-ranked fencers each vying for qualification from Asia and Oceania in the FIE Adjusted Official Rankings.
Eight more fencers were officially named to the host nation's roster on April 25, 2021, including Rio 2016 Olympians Kazuyasu Minobe (men's épée) and Chika Aoki (women's sabre) and American-born Kaito Streets (men's sabre).

### Men

| Athlete | Event | Round of 64 | Round of 32 | Round of 16 | Quarterfinals | Semifinals | Final / BM | Final / BM |
| Athlete | Event | Opposition Score | Opposition Score | Opposition Score | Opposition Score | Opposition Score | Opposition Score | Rank |
| Koki Kano | Épée | Bye | E Garozzo (ITA) W 15–12 | Bida (ROC) L 12–15 | Did not advance | Did not advance | Did not advance | Did not advance |
| Kazuyasu Minobe | Épée | Bye | Jurka (CZE) W 15–14 | Park S-y (KOR) L 6–15 | Did not advance | Did not advance | Did not advance | Did not advance |
| Masaru Yamada | Épée | Bye | Petrov (KGZ) W 15–13 | Kurbanov (KAZ) W 15–8 | Santarelli (ITA) L 13–15 | Did not advance | Did not advance | Did not advance |
| Koki Kano Kazuyasu Minobe Satoru Uyama Masaru Yamada | Team épée | — | — | United States (USA) W 45–39 | France (FRA) W 45–44 | South Korea (KOR) W 45–38 | ROC W 45–36 | |
| Kyosuke Matsuyama | Foil | Bye | Pauty (FRA) W 15–7 | D Garozzo (ITA) L 14–15 | Did not advance | Did not advance | Did not advance | Did not advance |
| Toshiya Saito | Foil | Bye | Toldo (BRA) W 15–10 | Lefort (FRA) L 4–15 | Did not advance | Did not advance | Did not advance | Did not advance |
| Takahiro Shikine | Foil | Bye | Samandi (TUN) W 15–4 | Choi (HKG) W 15–6 | Abouelkassem (EGY) W 15–13 | D Garozzo (ITA) L 9–15 | Choupenitch (CZE) L 8–15 | 4 |
| Kyosuke Matsuyama Yudai Nagano Toshiya Saito Takahiro Shikine | Team foil | — | — | Bye | Italy (ITA) W 45–43 | France (FRA) L 42–45 | United States (USA) L 31–45 | 4 |
| Tomohiro Shimamura | Sabre | Mackiewicz (USA) L 13–15 | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance |
| Kaito Streets | Sabre | Bounabi (ALG) W 15–9 | Dershwitz (USA) L 9–15 | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance |
| Kento Yoshida | Sabre | Quintero (VEN) L 13–15 | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance |
| Tomohiro Shimamura Kaito Streets Kenta Tokunan Kento Yoshida | Team sabre | — | — | Egypt (EGY) L 42–45 | Did not advance | Did not advance | Did not advance | Did not advance |

### Women

| Athlete | Event | Round of 64 | Round of 32 | Round of 16 | Quarterfinals | Semifinals | Final / BM | Final / BM |
| Athlete | Event | Opposition Score | Opposition Score | Opposition Score | Opposition Score | Opposition Score | Opposition Score | Rank |
| Nozomi Satō | Épée | Bye | Kang Y-m (KOR) W 15–14 | Beljajeva (EST) L 10–15 | Did not advance | Did not advance | Did not advance | Did not advance |
| Rio Azuma | Foil | Bye | Jeon H-s (KOR) L 10–11 | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance |
| Sera Azuma | Foil | Bye | Ryan (CAN) L 11–12 | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance |
| Yuka Ueno | Foil | Bye | Mohamed (EGY) W 15–5 | Ross (USA) W 15–9 | Kiefer (USA) L 11–15 | Did not advance | Did not advance | Did not advance |
| Rio Azuma Sera Azuma Sumire Tsuji Yuka Ueno | Team foil | — | — | — | United States (USA) L 36–45 | Classification semifinal Egypt (EGY) W 45–27 | Fifth place match Canada (CAN) L 31–45 | 6 |
| Chika Aoki | Sabre | Dayibekova (UZB) L 9–15 | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance |
| Misaki Emura | Sabre | Bye | Gkountoura (GRE) W 15–8 | Brunet (FRA) L 12–15 | Did not advance | Did not advance | Did not advance | Did not advance |
| Norika Tamura | Sabre | Bye | Qian Jr (CHN) L 8–15 | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance |
| Chika Aoki Misaki Emura Shihomi Fukushima Norika Tamura | Team sabre | — | — | Tunisia (TUN) W 45–29 | ROC L 34–45 | Classification semifinal Hungary (HUN) W 45–42 | Fifth place match United States (USA) W 45–43 | 5 |

## Field hockey

Summary
Key:
* FT – After full time.
* P – Match decided by penalty-shootout.
| Team | Event | Group stage | Group stage | Group stage | Group stage | Group stage | Group stage | Quarter-finals | Semi-finals | GM / BM | GM / BM |
| Team | Event | Opposition Score | Opposition Score | Opposition Score | Opposition Score | Opposition Score | Rank | Opposition Score | Opposition Score | Opposition Score | Rank |
| Japan men's | Men's tournament | Australia L 3–5 | Argentina L 1–2 | New Zealand D 2–2 | Spain L 1–4 | India L 3–5 | 6 | did not advance | did not advance | did not advance | 11 |
| Japan women's | Women's tournament | China L 3–4 | New Zealand L 1–2 | Australia L 0–1 | Argentina L 1–2 | Spain L 1–4 | 6 | did not advance | did not advance | did not advance | 11 |

### Men's tournament

As the host nation, Japan men's field hockey team qualified for the Olympics by virtue of obtaining a world ranking equal to or better than thirtieth place by the end of 2018, or not finish lower than sixth at the 2018 Asian Games.
Team roster
The squad was announced on 8 June 2021.
Head coach: Siegfried Aikman
| No. | Pos. | Player | Date of birth (age) | Caps | Goals | Club |
| 1 | FW | Koji Yamasaki | (1996-02-27)27 February 1996 (aged 25) | 97 | 28 | Gifu Asahi Club |
| 4 | MF | Genki Mitani | (1990-06-12)12 June 1990 (aged 31) | 168 | 6 | Vercosta Fukui |
| 5 | MF | Seren Tanaka | (1992-11-09)9 November 1992 (aged 28) | 103 | 8 | Gifu Asahi Club |
| 6 | MF | Hiromasa Ochiai | (1994-02-09)9 February 1994 (aged 27) | 75 | 5 | Tochigi Liebe |
| 7 | FW | Kazuma Murata | (1991-11-28)28 November 1991 (aged 29) | 120 | 33 | Tochigi Liebe |
| 9 | FW | Kenta Tanaka | (1988-05-04)4 May 1988 (aged 33) | 154 | 80 | HGC |
| 11 | FW | Kenji Kitazato | (1989-05-19)19 May 1989 (aged 32) | 162 | 50 | Alder Hanno |
| 12 | MF | Yuma Nagai | (1996-03-18)18 March 1996 (aged 25) | 11 | 0 | Gifu Asahi Club |
| 13 | DF | Manabu Yamashita (Captain) | (1989-02-04)4 February 1989 (aged 32) | 186 | 1 | Oyabe Redox |
| 14 | MF | Kaito Tanaka | (1995-11-01)1 November 1995 (aged 25) | 45 | 5 | Indicator Light Fullertel |
| 15 | MF | Ken Nagayoshi | (1999-10-26)26 October 1999 (aged 21) | 12 | 0 | Tenri University Bears |
| 17 | FW | Kentaro Fukuda | (1995-07-27)27 July 1995 (aged 25) | 69 | 15 | Gifu Asahi Club |
| 20 | DF | Masaki Ohashi | (1993-05-08)8 May 1993 (aged 28) | 94 | 0 | Tochigi Liebe |
| 25 | DF | Shota Yamada | (1994-12-21)21 December 1994 (aged 26) | 102 | 32 | Gifu Asahi Club |
| 29 | DF | Hirotaka Zendana | (1993-02-14)14 February 1993 (aged 28) | 119 | 30 | Tenri University Bears |
| 30 | GK | Takashi Yoshikawa | (1994-11-29)29 November 1994 (aged 26) | 94 | 0 | Gifu Asahi Club |
| 31 | FW | Kota Watanabe | (1996-10-30)30 October 1996 (aged 24) | 74 | 8 | Vercosta Fukui |
| 32 | DF | Yoshiki Kirishita | (1998-12-27)27 December 1998 (aged 22) | 55 | 4 | Tochigi Liebe |
Group play
| Pos | Teamvte | Pld | W | D | L | GF | GA | GD | Pts | Qualification |
| 1 | Australia | 5 | 4 | 1 | 0 | 22 | 9 | +13 | 13 | Quarter-finals |
| 2 | India | 5 | 4 | 0 | 1 | 15 | 13 | +2 | 12 | Quarter-finals |
| 3 | Argentina | 5 | 2 | 1 | 2 | 10 | 11 | −1 | 7 | Quarter-finals |
| 4 | Spain | 5 | 1 | 2 | 2 | 9 | 10 | −1 | 5 | Quarter-finals |
| 5 | New Zealand | 5 | 1 | 1 | 3 | 11 | 16 | −5 | 4 | |
| 6 | Japan (H) | 5 | 0 | 1 | 4 | 10 | 18 | −8 | 1 | |
* 24 July 2021 (2021-07-24) 09:30 v
| Japan | 3–5 | Australia |
| Ke. Tanaka 22', 27' Kirishita 26' | Report | Brand 11' Craig 14' Govers 31' Zalewski 38' Beale 50' |
* North Pitch Umpires: Jakub Mejzlík (CZE) Lim Hong-Zhen (SGP)
* 25 July 2021 (2021-07-25) 19:00 v
| Japan | 1–2 | Argentina |
| Ke. Tanaka 60' | Report | Tolini 5' Keenan 19' |
* South Pitch Umpires: Raghu Prasad (IND) Peter Wright (RSA)
* 27 July 2021 (2021-07-27) 11:45 v
| Japan | 2–2 | New Zealand |
| Yamasaki 3' Ke. Tanaka 40' | Report | Wilson 11' Lane 41' |
* North Pitch Umpires: Ben Göntgen (GER) Germán Montes de Oca (ARG)
* 28 July 2021 (2021-07-28) 20:45 v
| Japan | 1–4 | Spain |
| Zendana 2' | Report | Lleonart 3', 55' Quemada 23' Alegre 28' |
* North Pitch Umpires: Lim Hong Zhen (SGP) Martin Madden (GBR)
* 30 July 2021 (2021-07-30) 18:30 v
| Japan | 3–5 | India |
| Ke. Tanaka 19' Watanabe 33' Murata 59' | Report | Harmanpreet 13' Gurjant 17', 56' Shamsher 34' Nilakanta 51' |
* North Pitch Umpires: David Tomlinson (NZL) Lim Hong Zhen (SGP)

### Women's tournament

As the host nation, Japan women's field hockey team qualified for the Olympics by virtue of obtaining a world ranking equal to or better than thirtieth place by the end of 2018, or not finish lower than sixth at the 2018 Asian Games.
Team roster
The squad was announced on 8 June 2021.
Head coach: Xavier Arnau
| No. | Pos. | Player | Date of birth (age) | Caps | Goals | Club |
| 1 | DF | Yu Asai | (1996-01-08)8 January 1996 (aged 25) | 78 | {{{goals}}} | Coca-Cola Red Sparks |
| 3 | DF | Kimika Hoshi | (1996-01-26)26 January 1996 (aged 25) | 46 | {{{goals}}} | Sony H.C. BRAVIA Ladies |
| 6 | DF | Emi Nishikori | (1993-01-09)9 January 1993 (aged 28) | 73 | {{{goals}}} | Coca-Cola Red Sparks |
| 7 | FW | Kana Nomura | (1990-03-23)23 March 1990 (aged 31) | 128 | {{{goals}}} | Southern Metropolis Silver Shooting Stars |
| 8 | MF | Yukari Mano (captain) | (1994-03-04)4 March 1994 (aged 27) | 124 | {{{goals}}} | Sony H.C. BRAVIA Ladies |
| 9 | FW | Yuri Nagai | (1992-05-26)26 May 1992 (aged 29) | 179 | {{{goals}}} | Sony H.C. BRAVIA Ladies |
| 10 | MF | Hazuki Nagai | (1994-08-15)15 August 1994 (aged 26) | 173 | {{{goals}}} | Sony H.C. BRAVIA Ladies |
| 11 | DF | Shihori Oikawa | (1989-03-12)12 March 1989 (aged 32) | 133 | {{{goals}}} | Tokyo Verdy Hockey Team |
| 13 | DF | Miki Kozuka | (1996-01-13)13 January 1996 (aged 25) | 65 | {{{goals}}} | GlaxoSmithKline Orange United |
| 14 | MF | Maho Segawa | (1996-06-23)23 June 1996 (aged 25) | 46 | {{{goals}}} | Tokyo Verdy Hockey Team |
| 15 | FW | Mai Toriyama | (1995-04-13)13 April 1995 (aged 26) | 15 | {{{goals}}} | Southern Metropolis Silver Shooting Stars |
| 16 | DF | Natsuha Matsumoto | (1995-07-31)31 July 1995 (aged 25) | 43 | {{{goals}}} | Coca-Cola Red Sparks |
| 17 | FW | Aki Yamada | (1992-11-24)24 November 1992 (aged 28) | 27 | {{{goals}}} | Coca-Cola Red Sparks |
| 18 | FW | Aki Mitsuhashi | (1989-09-12)12 September 1989 (aged 31) | | {{{goals}}} | |
| 19 | FW | Kanon Mori | (1996-05-01)1 May 1996 (aged 25) | 28 | {{{goals}}} | Coca-Cola Red Sparks |
| 25 | FW | Kaho Tanaka | (1997-10-25)25 October 1997 (aged 23) | | {{{goals}}} | |
| 29 | MF | Sakurako Omoto | (1998-03-19)19 March 1998 (aged 23) | 31 | {{{goals}}} | Coca-Cola Red Sparks |
| 32 | GK | Sakiyo Asano | (1987-05-26)26 May 1987 (aged 34) | 111 | {{{goals}}} | Gifu Morning Ladies |
Group play
| Pos | Teamvte | Pld | W | D | L | GF | GA | GD | Pts | Qualification |
| 1 | Australia | 5 | 5 | 0 | 0 | 13 | 1 | +12 | 15 | Quarterfinals |
| 2 | Spain | 5 | 3 | 0 | 2 | 9 | 8 | +1 | 9 | Quarterfinals |
| 3 | Argentina | 5 | 3 | 0 | 2 | 8 | 8 | 0 | 9 | Quarterfinals |
| 4 | New Zealand | 5 | 2 | 0 | 3 | 8 | 7 | +1 | 6 | Quarterfinals |
| 5 | China | 5 | 2 | 0 | 3 | 9 | 16 | −7 | 6 | |
| 6 | Japan (H) | 5 | 0 | 0 | 5 | 6 | 13 | −7 | 0 | |
* 25 July 2021 (2021-07-25) 11:45 v
| Japan | 3–4 | China |
| Nomura 21' Y. Nagai 31' H. Nagai 45+' | Report | Gu 10', 35' Zhang Y. 20' Liang 52' |
* North Pitch Umpires: Ayanna McClean (TTO) Michelle Meister (GER)
* 26 July 2021 (2021-07-26) 20:45 v
| Japan | 1–2 | New Zealand |
| Oikawa 18' | Report | Merry 26' Ralph 29' |
* North Pitch Umpires: Irene Presenqui (ARG) Annelize Rostron (RSA)
* 28 July 2021 (2021-07-28) 18:30 v
| Japan | 0–1 | Australia |
| | Report | M. Fitzpatrick 33' |
* North Pitch Umpires: Maggie Giddens (USA) Liu Xiaoying (CHN)
* 29 July 2021 (2021-07-29) 20:45 v
| Japan | 1–2 | Argentina |
| Mori 19' | Report | Gorzelany 10' M. Granatto 45' |
* North Pitch Umpires: Kelly Hudson (NZL) Ayanna McClean (TTO)
* 31 July 2021 (2021-07-31) 10:00 v
| Japan | 1–4 | Spain |
| Mori 6' | Report | Barrios 25' García Grau 38' Mejías 55' Bonastre 57' |
* South Pitch Umpires: Sarah Wilson (GBR) Maggie Giddens (USA)

## Football (soccer)

Summary
Key:
* A.E.T – After extra time.
* P – Match decided by penalty-shootout.
| Team | Event | Group stage | Group stage | Group stage | Group stage | Quarter-finals | Semi-finals | Bronze medal match | Bronze medal match |
| Team | Event | Opposition Score | Opposition Score | Opposition Score | Rank | Opposition Score | Opposition Score | Opposition Score | Rank |
| Japan men's | Men's tournament | South Africa W 1–0 | Mexico W 2–1 | France W 4–0 | 1 Q | New Zealand D 0–0 (4–2) | Spain L 0–1 | Mexico L 1–3 | 4 |
| Japan women's | Women's tournament | Canada D 1–1 | Great Britain L 0–1 | Chile W 1–0 | 3 Q | Sweden L 1–3 | Did not advance | Did not advance | 8 |

### Men's tournament

Japan men's football team automatically qualified for the Olympics as the host nation.
Team roster Japan's final squad was announced on 22 June 2021.
Head coach: Hajime Moriyasu
| No. | Pos. | Player | Date of birth (age) | Club |
| 1 | 1GK | Keisuke Osako | (1999-07-28)28 July 1999 (aged 21) | Sanfrecce Hiroshima |
| 2 | 2DF | Hiroki Sakai* | (1990-04-12)12 April 1990 (aged 31) | Marseille |
| 3 | 2DF | Yuta Nakayama | (1997-02-16)16 February 1997 (aged 24) | PEC Zwolle |
| 4 | 2DF | Ko Itakura | (1997-01-27)27 January 1997 (aged 24) | Groningen |
| 5 | 2DF | Maya Yoshida* (captain) | (1988-08-24)24 August 1988 (aged 32) | Sampdoria |
| 6 | 3MF | Wataru Endō* | (1993-02-09)9 February 1993 (aged 28) | VfB Stuttgart |
| 7 | 4FW | Takefusa Kubo | (2001-06-04)4 June 2001 (aged 20) | Getafe |
| 8 | 3MF | Koji Miyoshi | (1997-03-26)26 March 1997 (aged 24) | Antwerp |
| 9 | 4FW | Daizen Maeda | (1997-10-20)20 October 1997 (aged 23) | Yokohama F. Marinos |
| 10 | 3MF | Ritsu Dōan | (1998-06-16)16 June 1998 (aged 23) | Arminia Bielefeld |
| 11 | 4FW | Kaoru Mitoma | (1997-05-20)20 May 1997 (aged 24) | Kawasaki Frontale |
| 12 | 1GK | Kosei Tani | (2000-11-22)22 November 2000 (aged 20) | Shonan Bellmare |
| 13 | 3MF | Reo Hatate | (1997-11-21)21 November 1997 (aged 23) | Kawasaki Frontale |
| 14 | 2DF | Takehiro Tomiyasu | (1998-11-05)5 November 1998 (aged 22) | Bologna |
| 15 | 2DF | Daiki Hashioka | (1999-05-17)17 May 1999 (aged 22) | Sint-Truiden |
| 16 | 4FW | Yuki Soma | (1997-02-25)25 February 1997 (aged 24) | Nagoya Grampus |
| 17 | 3MF | Ao Tanaka | (1998-09-10)10 September 1998 (aged 22) | Kawasaki Frontale |
| 18 | 4FW | Ayase Ueda | (1998-08-28)28 August 1998 (aged 22) | Kashima Antlers |
| 19 | 4FW | Daichi Hayashi | (1997-05-23)23 May 1997 (aged 24) | Sagan Tosu |
| 20 | 2DF | Koki Machida | (1997-08-25)25 August 1997 (aged 23) | Kashima Antlers |
| 21 | 2DF | Ayumu Seko | (2000-06-07)7 June 2000 (aged 21) | Cerezo Osaka |
| 22 | 1GK | Zion Suzuki | (2002-08-21)21 August 2002 (aged 18) | Urawa Red Diamonds |
* Overage player
Group play
| Pos | Teamvte | Pld | W | D | L | GF | GA | GD | Pts | Qualification |
| 1 | Japan (H) | 3 | 3 | 0 | 0 | 7 | 1 | +6 | 9 | Advance to knockout stage |
| 2 | Mexico | 3 | 2 | 0 | 1 | 8 | 3 | +5 | 6 | Advance to knockout stage |
| 3 | France | 3 | 1 | 0 | 2 | 5 | 11 | −6 | 3 | |
| 4 | South Africa | 3 | 0 | 0 | 3 | 3 | 8 | −5 | 0 | |
Quarterfinal
Semifinal
Bronze medal match

### Women's tournament

Japan women's football team automatically qualified for the Olympics as the host nation.
Team roster The final squad of 22 athletes was announced on 18 June 2021.
Head coach: Asako Takakura
| No. | Pos. | Player | Date of birth (age) | Caps | Goals | Club |
| 1 | 1GK | Sakiko Ikeda | (1992-09-08) 8 September 1992 (age 32) | 18 | 0 | Urawa Reds |
| 2 | 2DF | Risa Shimizu | (1996-06-15) 15 June 1996 (age 28) | 37 | 1 | Nippon TV Tokyo Verdy Beleza |
| 3 | 2DF | Saori Takarada | (1999-12-27) 27 December 1999 (age 25) | 7 | 1 | Washington Spirit |
| 4 | 2DF | Saki Kumagai (captain) | (1990-10-17) 17 October 1990 (age 34) | 114 | 1 | Lyon |
| 5 | 2DF | Moeka Minami | (1998-12-07) 7 December 1998 (age 26) | 15 | 1 | Urawa Reds |
| 6 | 3MF | Hina Sugita | (1997-01-31) 31 January 1997 (age 28) | 23 | 2 | INAC Kobe Leonessa |
| 7 | 3MF | Emi Nakajima | (1990-09-27) 27 September 1990 (age 34) | 85 | 14 | INAC Kobe Leonessa |
| 8 | 3MF | Narumi Miura | (1997-07-03) 3 July 1997 (age 27) | 24 | 1 | Nippon TV Tokyo Verdy Beleza |
| 9 | 4FW | Yuika Sugasawa | (1990-10-05) 5 October 1990 (age 34) | 75 | 24 | Urawa Reds |
| 10 | 4FW | Mana Iwabuchi | (1993-03-18) 18 March 1993 (age 31) | 77 | 35 | Aston Villa |
| 11 | 4FW | Mina Tanaka | (1994-04-28) 28 April 1994 (age 30) | 47 | 23 | INAC Kobe Leonessa |
| 12 | 4FW | Jun Endo | (2000-05-24) 24 May 2000 (age 24) | 17 | 1 | Nippon TV Tokyo Verdy Beleza |
| 13 | 3MF | Yuzuho Shiokoshi | (1997-11-01) 1 November 1997 (age 27) | 3 | 2 | Urawa Reds |
| 14 | 3MF | Yui Hasegawa | (1997-01-29) 29 January 1997 (age 28) | 46 | 11 | Milan |
| 15 | 4FW | Yuka Momiki | (1996-04-09) 9 April 1996 (age 28) | 38 | 14 | OL Reign |
| 16 | 2DF | Asato Miyagawa | (1998-02-24) 24 February 1998 (age 27) | 14 | 0 | Nippon TV Tokyo Verdy Beleza |
| 17 | 2DF | Nanami Kitamura | (1999-11-25) 25 November 1999 (age 25) | 3 | 0 | Nippon TV Tokyo Verdy Beleza |
| 18 | 1GK | Ayaka Yamashita | (1995-09-29) 29 September 1995 (age 29) | 40 | 0 | Nippon TV Tokyo Verdy Beleza |
| 19 | 2DF | Shiori Miyake | (1995-10-13) 13 October 1995 (age 29) | 25 | 0 | INAC Kobe Leonessa |
| 20 | 3MF | Honoka Hayashi | (1998-05-19) 19 May 1998 (age 26) | 6 | 0 | AIK |
| 21 | 3MF | Momoka Kinoshita | (2003-03-02) 2 March 2003 (age 21) | 4 | 1 | Nippon TV Tokyo Verdy Beleza |
| 22 | 1GK | Chika Hirao | (1996-12-31) 31 December 1996 (age 28) | 2 | 0 | Albirex Niigata |
Group play
| Pos | Teamvte | Pld | W | D | L | GF | GA | GD | Pts | Qualification |
| 1 | Great Britain | 3 | 2 | 1 | 0 | 4 | 1 | +3 | 7 | Advance to knockout stage |
| 2 | Canada | 3 | 1 | 2 | 0 | 4 | 3 | +1 | 5 | Advance to knockout stage |
| 3 | Japan (H) | 3 | 1 | 1 | 1 | 2 | 2 | 0 | 4 | Advance to knockout stage |
| 4 | Chile | 3 | 0 | 0 | 3 | 1 | 5 | −4 | 0 | |
Quarterfinal

## Golf

Japan entered two male and two female golfers into the Olympic tournament.
| Athlete | Event | Round 1 | Round 2 | Round 3 | Round 4 | Total | Total | Total |
| Athlete | Event | Score | Score | Score | Score | Score | Par | Rank |
| Hideki Matsuyama | Men's | 69 | 64 | 67 | 69 | 269 | −15 | =4 |
| Rikuya Hoshino | Men's | 71 | 68 | 73 | 66 | 278 | −6 | =38 |
| Nasa Hataoka | Women's | 70 | 68 | 67 | 69 | 274 | −10 | =9 |
| Mone Inami | Women's | 70 | 65 | 68 | 65 | 268 | −16 | |

## Gymnastics
### Artistic

Japan fielded a full squad of four gymnasts each in both the men's and women artistic gymnastics events, respectively. The men's team secured a berth in the team all-around by winning a bronze at the 2018 World Artistic Gymnastics Championships in Doha, Qatar, while the women's team claimed one of the nine spots available at the 2019 World Artistic Gymnastics Championships in Stuttgart, Germany. The women's team was named on 15 May 2021 at the conclusion of the NHK Cup. The full men's team was announced on 6 June 2021.

#### Men

Team
| Athlete | Event | Qualification | Qualification | Qualification | Qualification | Qualification | Qualification | Qualification | Qualification | Final | Final | Final | Final | Final | Final | Final | Final |
| Athlete | Event | Apparatus | Apparatus | Apparatus | Apparatus | Apparatus | Apparatus | Total | Rank | Apparatus | Apparatus | Apparatus | Apparatus | Apparatus | Apparatus | Total | Rank |
| Athlete | Event | F | PH | R | V | PB | HB | Total | Rank | F | PH | R | V | PB | HB | Total | Rank |
| Daiki Hashimoto | Team | 14.700 | 14.766 | 13.866 | 14.866 | 15.300 | 15.033 Q | 88.531 | 1 Q | 14.600 | 14.800 | 13.833 | 14.833 | — | 15.100 | — | — |
| Kazuma Kaya | Team | 13.933 | 14.833 Q | 14.366 | 13.200 | 15.100 | 14.033 | 85.465 | 9 | — | 14.566 | 14.100 | — | 15.000 | 14.200 | — | — |
| Takeru Kitazono | Team | 14.666 | 13.916 | 13.333 | 14.700 | 14.900 | 14.433 Q | 85.948 | 7 Q | 14.600 | 14.200 | — | 14.166 | 15.000 | 14.500 | — | — |
| Wataru Tanigawa | Team | 14.466 | 13.833 | 14.300 | 13.666 | 15.241 | 13.400 | 84.906 | 13 | 14.500 | — | 14.500 | 15.233 | 14.666 | — | — | — |
| Total | Team | 43.832 | 42.515 | 42.532 | 43.232 | 45.641 | 43.499 | 262.251 | 1 Q | 43.700 | 43.566 | 42.433 | 44.232 | 44.666 | 43.800 | 262.397 | |
Individual finals
| Athlete | Event | Qualification | Qualification | Qualification | Qualification | Qualification | Qualification | Qualification | Qualification | Final | Final | Final | Final | Final | Final | Final | Final |
| Athlete | Event | Apparatus | Apparatus | Apparatus | Apparatus | Apparatus | Apparatus | Total | Rank | Apparatus | Apparatus | Apparatus | Apparatus | Apparatus | Apparatus | Total | Rank |
| Athlete | Event | F | PH | R | V | PB | HB | Total | Rank | F | PH | R | V | PB | HB | Total | Rank |
| Daiki Hashimoto | All-around | See team results | See team results | See team results | See team results | See team results | See team results | See team results | See team results | 14.833 | 15.166 | 13.533 | 14.700 | 15.300 | 14.933 | 88.465 | |
| Daiki Hashimoto | Horizontal bar | — | — | — | — | — | 15.033 | 15.033 | 1 Q | — | — | — | — | — | 15.066 | 15.066 | |
| Kohei Kameyama | Pommel horse | — | 15.266 | — | — | — | — | 15.266 | 2 Q | — | 14.600 | — | — | — | — | 14.600 | 5 |
| Kazuma Kaya | Pommel horse | — | 14.833 | — | — | — | — | 14.833 | 7 Q | — | 14.900 | — | — | — | — | 14.900 | |
| Takeru Kitazono | All-around | See team results | See team results | See team results | See team results | See team results | See team results | See team results | See team results | 14.566 | 14.500 | 13.500 | 14.666 | 15.066 | 14.400 | 86.698 | 5 |
| Takeru Kitazono | Horizontal bar | — | — | — | — | — | 14.433 | 14.433 | 6 Q | — | — | — | — | — | 12.333 | 12.333 | 6 |
| Kōhei Uchimura | Horizontal bar | — | — | — | — | — | 13.866 | 13.866 | 20 | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance |

#### Women

Team
| Athlete | Event | Qualification | Qualification | Qualification | Qualification | Qualification | Qualification | Final | Final | Final | Final | Final | Final |
| Athlete | Event | Apparatus | Apparatus | Apparatus | Apparatus | Total | Rank | Apparatus | Apparatus | Apparatus | Apparatus | Total | Rank |
| Athlete | Event | V | UB | BB | F | Total | Rank | V | UB | BB | F | Total | Rank |
| Hitomi Hatakeda | Team | 12.266 | 14.133 | 13.000 | 13.333 | 52.732 | 39 | — | 14.100 | 13.333 | 12.800 | — | — |
| Yuna Hiraiwa | Team | 13.733 | 11.700 | 13.533 | 12.666 | 51.632 | 49 | 13.900 | — | 13.566 | — | — | — |
| Mai Murakami | Team | 14.433 | 12.133 | 13.366 | 13.933 Q | 53.965 | 23 Q | 14.266 | 12.700 | 13.833 | 14.066 | — | — |
| Aiko Sugihara | Team | 14.266 | 13.366 | 11.566 | 13.333 | 52.531 | 41 | 14.183 | 13.333 | — | 13.200 | — | — |
| Total | Team | 42.432 | 39.632 | 39.999 | 40.599 | 162.662 | 8 Q | 42.349 | 40.133 | 40.732 | 40.066 | 163.280 | 5 |
Individual finals
| Athlete | Event | Qualification | Qualification | Qualification | Qualification | Qualification | Qualification | Final | Final | Final | Final | Final | Final |
| Athlete | Event | Apparatus | Apparatus | Apparatus | Apparatus | Total | Rank | Apparatus | Apparatus | Apparatus | Apparatus | Total | Rank |
| Athlete | Event | V | UB | BB | F | Total | Rank | V | UB | BB | F | Total | Rank |
| Urara Ashikawa | Balance beam | — | — | 13.900 | — | 13.900 | 12 Q* | — | — | 13.733 | — | 13.733 | 6 |
| Mai Murakami | All-around | See team results | See team results | See team results | See team results | See team results | See team results | 14.533 | 13.733 | 13.766 | 14.000 | 56.032 | 5 |
| Mai Murakami | Floor exercise | — | — | — | 13.933 | 13.933 | 8 Q | — | — | — | 14.166 | 14.166 | |

### Rhythmic

As the host nation, Japan automatically received a guaranteed place in the group all-around competition at the Games. One rhythmic gymnast was added to the roster by finishing in the top sixteen of the individual all-around at the 2019 World Championships in Baku. Chisaki Oiwa qualified an additional spot through the 2021 World Cup series. The athletes for the group all-around were announced on 2 July 2021.
| Athlete | Event | Qualification | Qualification | Qualification | Qualification | Qualification | Qualification | Final | Final | Final | Final | Final | Final |
| Athlete | Event | Hoop | Ball | Clubs | Ribbon | Total | Rank | Hoop | Ball | Clubs | Ribbon | Total | Rank |
| Chisaki Oiwa | Individual | 23.100 | 19.600 | 23.600 | 21.250 | 87.550 | 19 | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance |
| Sumire Kita | Individual | 23.150 | 23.900 | 24.550 | 21.200 | 92.800 | 11 | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance |
| Athletes | Event | Qualification | Qualification | Qualification | Qualification | Final | Final | Final | Final |
| Athletes | Event | 5 apps | 3+2 apps | Total | Rank | 5 apps. | 3+2 apps | Total | Rank |
| Sakura Noshitani Sayuri Sugimoto Ayuka Suzuki Nanami Takenaka Kiko Yokota | Group | 40.400 | 39.325 | 79.725 | 7 Q | 42.750 | 29.750 | 72.500 | 8 |

### Trampoline

Japan qualified one gymnast each for the men's and women's trampoline by finishing in the top eight, respectively, at the 2019 World Championships in Tokyo. Japan qualified an additional spot in both men's and women's trampoline through the 2019–2020 Trampoline World Cup series.
| Athlete | Event | Qualification | Qualification | Final | Final |
| Athlete | Event | Score | Rank | Score | Rank |
| Daiki Kishi | Men's | 111.540 | 6 Q | 57.815 | 7 |
| Ryosuke Sakai | Men's | 62.250 | 15 | Did not advance | Did not advance |
| Hikaru Mori | Women's | 63.775 | 13 | Did not advance | Did not advance |
| Megu Uyama | Women's | 103.585 | 5 Q | 54.655 | 5 |

## Handball
### Summary

Key:
* ET: After extra time
* P – Match decided by penalty-shootout.
| Team | Event | Group stage | Group stage | Group stage | Group stage | Group stage | Group stage | Quarter-finals | Semi-finals | GM / BM | GM / BM |
| Team | Event | Opposition Score | Opposition Score | Opposition Score | Opposition Score | Opposition Score | Rank | Opposition Score | Opposition Score | Opposition Score | Rank |
| Japan men's | Men's tournament | Denmark L 30–47 | Sweden L 26–28 | Egypt L 29–33 | Bahrain L 30–32 | Portugal W 31–30 | 6 | Did not advance | Did not advance | Did not advance | Did not advance |
| Japan women's | Women's tournament | Netherlands L 21–32 | Montenegro W 29–26 | South Korea L 24–27 | Angola L 25–28 | Norway L 25–37 | 6 | Did not advance | Did not advance | Did not advance | Did not advance |

### Men's tournament

Japan men's handball team automatically qualified for the Olympics as the host nation.
Team roster The squad was announced on 8 July 2021.
Head coach: Dagur Sigurðsson
* No.
* Pos.
* Name
* Date of birth (age)
* Height
* App.
* Goals
* Club
* 10
* LW
* Naoki Sugioka
* (1994-04-18)18 April 1994 (aged 27)
* 1.77 m
* 33
* 37
* Toyota Auto Body
* 12
* GK
* Yuta Iwashita
* (1991-06-21)21 June 1991 (aged 30)
* 1.83 m
* 20
* 1
* Toyota Boshoku Kyushu
* 13
* P
* Kenya Kasahara
* (1988-05-15)15 May 1988 (aged 33)
* 1.97 m
* 77
* 64
* Toyota Auto Body
* 15
* LB
* Adam Yuki Baig
* (1999-04-12)12 April 1999 (aged 22)
* 1.94 m
* 43
* 79
* Chuo University
* 18
* LB
* Kohei Narita
* (1989-06-15)15 June 1989 (aged 32)
* 1.91 m
* 93
* 136
* Wakunaga Pharmaceutical
* 19
* RB
* Shinnosuke Tokuda
* (1995-12-06)6 December 1995 (aged 25)
* 1.78 m
* 63
* 224
* Toyoda Gosei
* 20
* RB
* Jin Watanabe
* (1990-01-17)17 January 1990 (aged 31)
* 1.83 m
* 95
* 305
* Toyota Auto Body
* 21
* LW
* Remi Anri Doi
* (1989-09-28)28 September 1989 (aged 31)
* 1.80 m
* 60
* 145
* Zeekstar Tokyo
* 22
* GK
* Motoki Sakai
* (1995-11-10)10 November 1995 (aged 25)
* 1.92 m
* 25
* 3
* Toyoda Gosei
* 25
* RW
* Hiroki Motoki
* (1992-02-14)14 February 1992 (aged 29)
* 1.82 m
* 86
* 235
* Osaki Osol
* 31
* LB
* Tatsuki Yoshino
* (1994-07-13)13 July 1994 (aged 27)
* 1.83 m
* 46
* 181
* Toyota Auto Body
* 33
* CB
* Yuto Agarie
* (1993-07-06)6 July 1993 (aged 28)
* 1.83 m
* 69
* 238
* Zeekstar Tokyo
* 38
* CB
* Kotaro Mizumachi
* (1995-03-13)13 March 1995 (aged 26)
* 1.83 m
* 8
* 12
* Toyoda Gosei
* 41
* RB
* Rennosuke Tokuda
* (1998-05-15)15 May 1998 (aged 23)
* 1.80 m
* 11
* 20
* Grupa Azoty Tarnów
* 43
* P
* Shuichi Yoshida
* (2001-03-26)26 March 2001 (aged 20)
* 1.91 m
* 10
* 23
* Grupa Azoty Tarnów
Group play
| Pos | Teamvte | Pld | W | D | L | GF | GA | GD | Pts | Qualification |
| 1 | Denmark | 5 | 4 | 0 | 1 | 174 | 139 | +35 | 8 | Quarter-finals |
| 2 | Egypt | 5 | 4 | 0 | 1 | 154 | 134 | +20 | 8 | Quarter-finals |
| 3 | Sweden | 5 | 4 | 0 | 1 | 144 | 142 | +2 | 8 | Quarter-finals |
| 4 | Bahrain | 5 | 1 | 0 | 4 | 129 | 149 | −20 | 2 | Quarter-finals |
| 5 | Portugal | 5 | 1 | 0 | 4 | 143 | 156 | −13 | 2 | |
| 6 | Japan (H) | 5 | 1 | 0 | 4 | 146 | 170 | −24 | 2 | |
* 1 2 3 Denmark 2 Pts, +2 GD; Egypt 2 Pts, 0 GD, Sweden 2 Pts, −2 GD
* 1 2 3 Bahrain 2 Pts, +1 GD; Portugal 2 Pts, 0 GD, Japan 2 Pts, −1 GD
| 24 July 2021 21:30 | Denmark | 47–30 | Japan | Yoyogi National Gymnasium, Tokyo Referees: Schulze, Tönnies (GER) |
| 24 July 2021 21:30 | Holm, Saugstrup 9 | (25–14) | Motoki 8 | Yoyogi National Gymnasium, Tokyo Referees: Schulze, Tönnies (GER) |
| 24 July 2021 21:30 | 1× 1× | Report | 1× 4× | Yoyogi National Gymnasium, Tokyo Referees: Schulze, Tönnies (GER) |
| 26 July 2021 21:30 | Japan | 26–28 | Sweden | Yoyogi National Gymnasium, Tokyo Referees: Lah, Sok (SLO) |
| 26 July 2021 21:30 | Motoki 6 | (14–17) | Wanne 8 | Yoyogi National Gymnasium, Tokyo Referees: Lah, Sok (SLO) |
| 26 July 2021 21:30 | 1× 4× | Report | 1× 1× | Yoyogi National Gymnasium, Tokyo Referees: Lah, Sok (SLO) |
| 28 July 2021 14:15 | Japan | 29–33 | Egypt | Yoyogi National Gymnasium, Tokyo Referees: Schulze, Tönnies (GER) |
| 28 July 2021 14:15 | Tokuda 8 | (11–18) | El-Ahmar 8 | Yoyogi National Gymnasium, Tokyo Referees: Schulze, Tönnies (GER) |
| 28 July 2021 14:15 | 1× 7× | Report | 2× | Yoyogi National Gymnasium, Tokyo Referees: Schulze, Tönnies (GER) |
| 30 July 2021 11:00 | Bahrain | 32–30 | Japan | Yoyogi National Gymnasium, Tokyo Referees: Raluy, Sabroso (ESP) |
| 30 July 2021 11:00 | Al-Sayyad, Habib 7 | (17–16) | Motoki 7 | Yoyogi National Gymnasium, Tokyo Referees: Raluy, Sabroso (ESP) |
| 30 July 2021 11:00 | 2× 4× | Report | 4× | Yoyogi National Gymnasium, Tokyo Referees: Raluy, Sabroso (ESP) |
| 1 August 2021 09:00 | Portugal | 30–31 | Japan | Yoyogi National Gymnasium, Tokyo Referees: Brunner, Salah (SUI) |
| 1 August 2021 09:00 | four players 4 | (14–16) | R. Tokuda 6 | Yoyogi National Gymnasium, Tokyo Referees: Brunner, Salah (SUI) |
| 1 August 2021 09:00 | 2× 4× | Report | 2× 2× | Yoyogi National Gymnasium, Tokyo Referees: Brunner, Salah (SUI) |

### Women's tournament

Japan women's handball team automatically qualified for the Olympics as the host nation.
Team roster The squad was announced on 28 June 2021. On 30 July, Kaho Sunami was replaced by Mana Horikawa.
Head coach: Ulrik Kirkely
* No.
* Pos.
* Name
* Date of birth (age)
* Height
* App.
* Goals
* Club
* 3
* P
* Kaho Sunami
* (1993-01-05)5 January 1993 (aged 28)
* 1.66 m
* 45
* 74
* Sony Semiconductor
* 4
* RB
* Yui Sunami
* (1991-06-07)7 June 1991 (aged 30)
* 1.62 m
* 59
* 160
* Hokkoku Bank
* 5
* LB
* Sayo Shiota
* (1989-03-21)21 March 1989 (aged 32)
* 1.72 m
* 66
* 62
* Hokkoku Bank
* 9
* CB
* Aya Yokoshima
* (1990-07-03)3 July 1990 (aged 31)
* 1.62 m
* 55
* 160
* Hokkoku Bank
* 11
* P
* Mana Horikawa
* (1994-03-04)4 March 1994 (aged 27)
* 1.74 m
* 17
* 2
* lzumi Maple Reds
* 12
* GK
* Minami Itano
* (1993-02-02)2 February 1993 (aged 28)
* 1.74 m
* 26
* 1
* lzumi Maple Reds
* 18
* LW
* Yuki Tanabe
* (1989-08-25)25 August 1989 (aged 31)
* 1.70 m
* 59
* 196
* Thüringer HC
* 21
* RW
* Ayaka Ikehara
* (1990-09-24)24 September 1990 (aged 30)
* 1.58 m
* 43
* 101
* Odense Håndbold
* 24
* LB
* Nozomi Hara
* (1991-03-09)9 March 1991 (aged 30)
* 1.70 m
* 78
* 224
* MIE violet' IRIS
* 25
* CB
* Mana Ohyama
* (1992-12-07)7 December 1992 (aged 28)
* 1.65 m
* 45
* 105
* Hokkoku Bank
* 27
* LB
* Haruno Sasaki
* (1995-02-26)26 February 1995 (aged 26)
* 1.72 m
* 23
* 80
* Hokkoku Bank
* 28
* P
* Shiori Nagata
* (1987-10-24)24 October 1987 (aged 33)
* 1.71 m
* 109
* 92
* Omron
* 30
* GK
* Sakura Hauge
* (1987-01-07)7 January 1987 (aged 34)
* 1.74 m
* 49
* 5
* ESBF Besançon
* 34
* LW
* Maharu Kondo
* (1996-01-24)24 January 1996 (aged 25)
* 1.58 m
* 0
* 0
* lzumi Maple Reds
* 40
* RB
* Shio Fujii
* (1985-03-27)27 March 1985 (aged 36)
* 1.64 m
* 121
* 613
* Osaka Lovvits
* 81
* CB
* Mayuko Ishitate
* (1987-01-18)18 January 1987 (aged 34)
* 1.67 m
* 96
* 201
* MIE violet' IRIS
Group play
| Pos | Teamvte | Pld | W | D | L | GF | GA | GD | Pts | Qualification |
| 1 | Norway | 5 | 5 | 0 | 0 | 170 | 123 | +47 | 10 | Quarter-finals |
| 2 | Netherlands | 5 | 4 | 0 | 1 | 169 | 143 | +26 | 8 | Quarter-finals |
| 3 | Montenegro | 5 | 2 | 0 | 3 | 139 | 142 | −3 | 4 | Quarter-finals |
| 4 | South Korea | 5 | 1 | 1 | 3 | 147 | 165 | −18 | 3 | Quarter-finals |
| 5 | Angola | 5 | 1 | 1 | 3 | 130 | 156 | −26 | 3 | |
| 6 | Japan (H) | 5 | 1 | 0 | 4 | 124 | 150 | −26 | 2 | |
* 1 2 South Korea 31–31 Angola
| 25 July 2021 09:00 | Netherlands | 32–21 | Japan | Yoyogi National Gymnasium, Tokyo Referees: García, Paolantoni (ARG) |
| 25 July 2021 09:00 | Abbingh 7 | (18–10) | Fujii 5 | Yoyogi National Gymnasium, Tokyo Referees: García, Paolantoni (ARG) |
| 25 July 2021 09:00 | 2× | Report | 1× 3× | Yoyogi National Gymnasium, Tokyo Referees: García, Paolantoni (ARG) |
| 27 July 2021 09:00 | Japan | 29–26 | Montenegro | Yoyogi National Gymnasium, Tokyo Referees: Alpaidze, Berezkina (RUS) |
| 27 July 2021 09:00 | Hara, Ikehara 6 | (14–13) | Brnović 6 | Yoyogi National Gymnasium, Tokyo Referees: Alpaidze, Berezkina (RUS) |
| 27 July 2021 09:00 | 1× 8× 1× | Report | 2× 3× | Yoyogi National Gymnasium, Tokyo Referees: Alpaidze, Berezkina (RUS) |
| 29 July 2021 14:15 | Japan | 24–27 | South Korea | Yoyogi National Gymnasium, Tokyo Referees: Kurtagic, Wetterwik (SWE) |
| 29 July 2021 14:15 | Kondo 7 | (11–12) | Ryu 9 | Yoyogi National Gymnasium, Tokyo Referees: Kurtagic, Wetterwik (SWE) |
| 29 July 2021 14:15 | 1× 3× | Report | 3× | Yoyogi National Gymnasium, Tokyo Referees: Kurtagic, Wetterwik (SWE) |
| 31 July 2021 09:00 | Angola | 28–25 | Japan | Yoyogi National Gymnasium, Tokyo Referees: García, Paolantoni (ARG) |
| 31 July 2021 09:00 | three players 5 | (15–13) | Hara 6 | Yoyogi National Gymnasium, Tokyo Referees: García, Paolantoni (ARG) |
| 31 July 2021 09:00 | 1× 2× | Report | 1× 1× | Yoyogi National Gymnasium, Tokyo Referees: García, Paolantoni (ARG) |
| 2 August 2021 21:30 | Norway | 37–25 | Japan | Yoyogi National Gymnasium, Tokyo Referees: El-Saied, El-Saied (EGY) |
| 2 August 2021 21:30 | Frafjord 6 | (16–11) | Ohyama, Yokoshima 5 | Yoyogi National Gymnasium, Tokyo Referees: El-Saied, El-Saied (EGY) |
| 2 August 2021 21:30 | 3× | Report | 2× 1× | Yoyogi National Gymnasium, Tokyo Referees: El-Saied, El-Saied (EGY) |

## Judo

As the host nation, Japanese judoka have already received fourteen quota places (seven in each gender) at their disposal for the Games.
On November 24, 2019, Akira Sone (women's +78 kg) became the first judoka to be selected to the host nation's squad for the Games, following her triumph at the IJF Grand Slam Cup in Osaka. Twelve more judoka were officially named to the roster on February 27, 2020, with Shohei Ono looking to defend his Olympic title in the men's 73-kg division on the home soil. Meanwhile, Hifumi Abe trounced the reigning world champion Joshiro Maruyama to lock the men's 66 kg spot in a gruelling 24-minute playoff at the Kodokan Judo Institute on December 13, 2020, completing the host nation's judo roster for the rescheduled Games.

### Men

| Athlete | Event | Round of 64 | Round of 32 | Round of 16 | Quarterfinals | Semifinals | Repechage | Final / BM | Final / BM |
| Athlete | Event | Opposition Result | Opposition Result | Opposition Result | Opposition Result | Opposition Result | Opposition Result | Opposition Result | Rank |
| Naohisa Takato | −60 kg | — | Bye | Verstraeten (BEL) W 01–00 | Chkhvimiani (GEO) W 10–00 | Smetov (KAZ) W 01–00 | Bye | Yang Y-w (TPE) W 10–00 | |
| Hifumi Abe | −66 kg | — | Bye | Le Blouch (FRA) W 10–00 | Yondonperenlei (MGL) W 01–00 | Cargnin (BRA) W 10–00 | Bye | Margvelashvili (GEO) W 01–00 | |
| Shohei Ono | −73 kg | Bye | Raicu (ROU) W 10–00 | Çiloğlu (TUR) W 10–00 | Orujov (AZE) W 10–00 | Tsend-Ochir (MGL) W 01–00 | Bye | Shavdatuashvili (GEO) W 01–00 | |
| Takanori Nagase | −81 kg | Bye | Albayrak (TUR) W 10–00 | Parlati (ITA) W 10–00 | Ressel (GER) W 01–00 | Casse (BEL) W 01–00 | Bye | Mollaei (MGL) W 01–00 | |
| Shoichiro Mukai | −90 kg | Bye | Feuillet (MRI) W 10–00 | Tóth (HUN) L 00–10 | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance |
| Aaron Wolf | −100 kg | — | Bye | Khurramov (UZB) W 10–00 | Paltchik (ISR) W 01–00 | Liparteliani (GEO) W 01–00 | Bye | Cho G-h (KOR) W 10–00 | |
| Hisayoshi Harasawa | +100 kg | — | Bye | Kim M-j (KOR) W 01–00 | Khammo (UKR) W 10–00 | Krpálek (CZE) L 00–01 | Bye | Riner (FRA) L 00–10 | 5 |

### Women

| Athlete | Event | Round of 32 | Round of 16 | Quarterfinals | Semifinals | Repechage | Final / BM | Final / BM |
| Athlete | Event | Opposition Result | Opposition Result | Opposition Result | Opposition Result | Opposition Result | Opposition Result | Rank |
| Funa Tonaki | −48 kg | Bye | Csernoviczki (HUN) W 10–00 | Pareto (ARG) W 10–00 | Bilodid (UKR) W 01–00 | Bye | Krasniqi (KOS) L 00–01 | |
| Uta Abe | −52 kg | Bye | Pimenta (BRA) W 10–00 | Giles (GBR) W 01–00 | Giuffrida (ITA) W 01–00 | Bye | Buchard (FRA) W 10–00 | |
| Tsukasa Yoshida | −57 kg | Bye | Lu Tj (CHN) W 10–00 | Nelson-Levy (ISR) W 01–00 | Gjakova (KOS) L 00–01 | Bye | Liparteliani (GEO) W 10–00 | |
| Miku Tashiro | −63 kg | Renshall (GBR) W 01–00 | Ozdoba-Błach (POL) L 00–10 | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance |
| Chizuru Arai | −70 kg | Bye | Pérez (PUR) W 10–00 | Scoccimarro (GER) W 10–00 | Taimazova (ROC) W 10–00 | Bye | Polleres (AUT) W 01–00 | |
| Shori Hamada | −78 kg | Bye | Pacut (POL) W 10–00 | Babintseva (ROC) W 11–00 | Wagner (GER) W 10–00 | Bye | Malonga (FRA) W 10–00 | |
| Akira Sone | +78 kg | Bye | Hershko (ISR) W 11–00 | Sayit (TUR) W 10–00 | Kindzerska (AZE) W 10–00 | Bye | Ortíz (CUB) W 10–00 | |

### Mixed

| Athlete | Event | Round of 16 | Quarterfinals | Semifinals | Repechage | Final / BM | Final / BM |
| Athlete | Event | Opposition Result | Opposition Result | Opposition Result | Opposition Result | Opposition Result | Rank |
| Shoichiro Mukai Shohei Ono Aaron Wolf Uta Abe Chizuru Arai Akira Sone Tsukasa Yoshida | Team | Bye | Germany (GER) W 4–2 | ROC W 4–0 | Bye | France (FRA) L 1–4 | |

## Karate

As the host nation, Japanese karateka have already received eight quota places (four in each gender) at their disposal for the Games. With the cancellation of the last qualifying tournaments before the April 6, 2020 cutoff because of the coronavirus pandemic, World Karate Federation officially named the Japanese karateka to take up the host nation places based on the country's selection criteria. Among the country's karateka were three-time world champion Ryo Kiyuna in the men's individual kata and multiple world medalist Ayumi Uekusa in the women's +61-kg kumite.
Kumite
| Athlete | Event | Group stage | Group stage | Group stage | Group stage | Group stage | Semifinals | Final | Final |
| Athlete | Event | Opposition Result | Opposition Result | Opposition Result | Opposition Result | Rank | Opposition Result | Opposition Result | Rank |
| Naoto Sago | Men's −67 kg | El-Sawy (EGY) W 4–3 | Farzaliyev (AZE) L 0–1 | Assadilov (KAZ) L 0–3 | Şamdan (TUR) L 1–2 | 4 | Did not advance | Did not advance | Did not advance |
| Ken Nishimura | Men's −75 kg | Scott (USA) W 2–0 | Horuna (UKR) L 1–2 | Abdelaziz (EGY) W 8–7 | Hárspataki (HUN) L 1–3 | 3 | Did not advance | Did not advance | Did not advance |
| Ryutaro Araga | Men's +75 kg | Arkania (GEO) W 3–2 | Yuldashev (KAZ) W 4–2 | Aktaş (TUR) W 5–3 | Horne (GER) W WO | 1 Q | Hamedi (KSA) L 0–2 | Did not advance | |
| Miho Miyahara | Women's −55 kg | Plank (AUT) W 6–2 | Sayed (EGY) L 3–5 | Zhangbyrbay (KAZ) W 11–2 | Terliuga (UKR) L 0–4 | 3 | Did not advance | Did not advance | Did not advance |
| Mayumi Someya | Women's −61 kg | Çoban (TUR) L 4–0 | Heurtault (FRA) W 6–3 | Yin Xy (CHN) L 2–4 | Garcés (VEN) L 5–8 | 4 | Did not advance | Did not advance | Did not advance |
| Ayumi Uekusa | Women's +61 kg | Semeraro (ITA) L 3–4 | Zaretska (AZE) L 1–4 | Hocaoğlu (TUR) W 5–4 | Berultseva (KAZ) W 5–1 | 3 | Did not advance | Did not advance | Did not advance |
Kata
| Athlete | Event | Elimination round | Elimination round | Ranking round | Ranking round | Final / BM | Final / BM |
| Athlete | Event | Score | Rank | Score | Rank | Opposition Result | Rank |
| Ryo Kiyuna | Men's kata | 28.33 | 1 Q | 28.72 | 1 Q | Quintero (ESP) W 28.72–27.66 | |
| Kiyou Shimizu | Women's kata | 27.70 | 1 Q | 27.86 | 1 Q | Sánchez (ESP) L 27.88–28.06 | |

## Modern pentathlon

Japanese athletes qualified for the following spots to compete in modern pentathlon. Rio 2016 Olympians Shōhei Iwamoto and Natsumi Tomonaga confirmed places each in the men's and women's event, respectively, with the former finishing fourth and the latter second among those eligible for Olympic qualification at the 2019 Asia & Oceania Championships in Kunming, China.
| Athlete | Event | Fencing (épée one touch) | Fencing (épée one touch) | Fencing (épée one touch) | Fencing (épée one touch) | Swimming (200 m freestyle) | Swimming (200 m freestyle) | Swimming (200 m freestyle) | Riding (show jumping) | Riding (show jumping) | Riding (show jumping) | Combined: shooting/running (10 m air pistol)/(3200 m) | Combined: shooting/running (10 m air pistol)/(3200 m) | Combined: shooting/running (10 m air pistol)/(3200 m) | Total points | Final rank |
| Athlete | Event | RR | BR | Rank | MP points | Time | Rank | MP points | Penalties | Rank | MP points | Time | Rank | MP Points | Total points | Final rank |
| Shōhei Iwamoto | Men's | 12–23 | 1 | 30 | 173 | 2:03.75 | 20 | 303 | 21 | 20 | 279 | 11:52.87 | 31 | 588 | 1343 | 28 |
| Rena Shimazu | Women's | 14–21 | 0 | 30 | 184 | 2:10.65 | 9 | 289 | 48 | 24 | 252 | 12:34.40 | 17 | 546 | 1271 | 23 |
| Natsumi Takamiya | Women's | 14–21 | 1 | 28 | 185 | 2:11.54 | 11 | 287 | EL | 31 | 0 | 2:11.54 | 26 | 513 | 985 | 34 |

## Rowing

Japan qualified two boats for each of the following rowing classes into the Olympic regatta. Rowing crews in the men's single sculls and women's lightweight double sculls confirmed Olympic places for their boats at the 2021 FISA Asia & Oceania Olympic Qualification Regatta in Tokyo.
| Athlete | Event | Heats | Heats | Repechage | Repechage | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Final | Final |
| Athlete | Event | Time | Rank | Time | Rank | Time | Rank | Time | Rank | Time | Rank |
| Ryuta Arakawa | Men's single sculls | 7:02.79 | 2 QF | Bye | Bye | 7:26.04 | 3 SA/B | 6:59.26 | 6 FB | 6:50.91 | 11 |
| Chiaki Tomita Ayami Oishi | Women's lightweight double sculls | 7:22.47 | 3 R | 7:34.45 | 3 SA/B | — | — | 6:56.52 | 5 FB | 6:54.94 | 10 |
Qualification Legend: FA=Final A (medal); FB=Final B (non-medal); FC=Final C (non-medal); FD=Final D (non-medal); FE=Final E (non-medal); FF=Final F (non-medal); SA/B=Semifinals A/B; SC/D=Semifinals C/D; SE/F=Semifinals E/F; QF=Quarterfinals; R=Repechage

## Rugby sevens
### Men's tournament

Japan men's rugby sevens team automatically qualified for the Olympics as the host nation.
Team roster Japan's 12-man squad plus one alternate was named on 6 July 2021.
Head coach: Kensuke Iwabuchi
| No. | Pos. | Player | Date of birth (age) | Events | Points |
| 1 | FW | Jose Seru | (1991-02-09)9 February 1991 (aged 30) | 3 | 0 |
| 2 | FW | Lote Tuqiri | (1987-11-12)12 November 1987 (aged 33) | 26 | 145 |
| 3 | FW | Colin Bourke | (1984-10-15)15 October 1984 (aged 36) | 2 | 27 |
| 4 | BK | Kazushi Hano | (1991-06-21)21 June 1991 (aged 30) | 16 | 80 |
| 5 | FW | Kameli Soejima | (1983-06-01)1 June 1983 (aged 38) | 21 | 222 |
| 6 | FW | Masakatsu Hikosaka | (1991-01-18)18 January 1991 (aged 30) | 13 | 40 |
| 7 | BK | Brackin Karauria-Henry | (1988-07-31)31 July 1988 (aged 33) | 8 | 150 |
| 8 | BK | Chihito Matsui (c) | (1994-11-11)11 November 1994 (aged 26) | 11 | 35 |
| 9 | BK | Ryota Kano | (1992-05-10)10 May 1992 (aged 29) | 10 | 37 |
| 10 | BK | Yoshikazu Fujita | (1993-09-08)8 September 1993 (aged 27) | 20 | 150 |
| 11 | BK | Kippei Ishida | (2000-04-28)28 April 2000 (aged 21) | 5 | 20 |
| 12 | BK | Naoki Motomura | (1992-04-11)11 April 1992 (aged 29) | 14 | 95 |
| 13 | BK | Kazuhiro Goya | (1993-04-12)12 April 1993 (aged 28) | 15 | 65 |
Group play
| Pos | Teamvte | Pld | W | D | L | PF | PA | PD | Pts | Qualification |
| 1 | Fiji | 3 | 3 | 0 | 0 | 85 | 40 | +45 | 9 | Quarter-finals |
| 2 | Great Britain | 3 | 2 | 0 | 1 | 65 | 33 | +32 | 7 | Quarter-finals |
| 3 | Canada | 3 | 1 | 0 | 2 | 50 | 64 | −14 | 5 | Quarter-finals |
| 4 | Japan (H) | 3 | 0 | 0 | 3 | 31 | 94 | −63 | 3 | |
* 26 July 2021 (2021-07-26) 9:00
| Fiji | 24–19 | Japan |
| Try: Wainiqolo 1' c Masi 4' m Nacuqu (2) 10' c, 11' m Con: Bolaca (1/2) 1' Nacuqu (1/1) 10' Nasoko (0/1) | (Tokyo 2020) | Try: Matsui 2' c Tuqiri 7' c Soejima 8' m Con: Fujita (2/3) 3', 7' |
* Tokyo Stadium, Tokyo Attendance: 0 Referee: Damon Murphy (Australia)
* 26 July 2021 (2021-07-26) 16:30
| Great Britain | 34–0 | Japan |
| Try: Bibby 1' m Mitchell 2' m Glover 7' c Harris 8' m Waddleton 9' m Davis 12' c Con: Bibby (2/6) 7', 12' | (Tokyo 2020) | |
* Tokyo Stadium, Tokyo Attendance: 0 Referee: Paulo Duarte (Portugal)
* 27 July 2021 (2021-07-27) 9:00
| Canada | 36–12 | Japan |
| Try: Braid (3) 2' c, 3' m, 9' m Sauder 5' c Berna 10' m Douglas 12' c Con: Hirayama (2/5) 2', 5' Kay (1/1) 12' | (Tokyo 2020) | Try: Hano 8' m Matsui 13' c Con: Bourke (0/1) Goya (1/1) 13' |
* Tokyo Stadium, Tokyo Attendance: 0 Referee: Damon Murphy (Australia)
9–12th place playoff
* 27 July 2021 (2021-07-27) 17:00
| Kenya | 21–7 | Japan |
| Try: Otieno 3' c Oluoch 5' c Amonde 12' c Con: Olindi (3/3) 4', 5', 12' | (Tokyo 2020) | Try: Matsui 1' c Con: Kano (1/1) 2' |
* Tokyo Stadium, Tokyo Attendance: 0 Referee: Damián Schneider (Argentina)
11th place match
* 28 July 2021 (2021-07-28) 9:00
| South Korea | 19–31 | Japan |
| Try: Coquillard 1' c Jang 4' m Jeong 10' c Con: Coquillard (2/3) 1', 10' | (Tokyo 2020) | Try: Tuqiri 2' c Hikosaka 5' c Kano 7' m Matsui 8' c Hano 11' m Con: Kano (3/4) 2', 6', 8' Fujita (0/1) |
* Tokyo Stadium, Tokyo Attendance: 0 Referee: Richard Haughton (England)

### Women's tournament

Japan women's rugby sevens team automatically qualified for the Olympics as the host nation.
Team roster
Japan's squad of 12 players was named on 19 June 2021.
Head coach: Hare Makiri
* Wakaba Hara
* Yume Hirano
* Haruka Hirotsu
* Marin Kajiki
* Mifuyu Koide
* Mio Yamanaka
* Riho Kurogi
* Hana Nagata
* Mei Ohtani
* Raichel Bativakalolo (c)
* Mayu Shimizu (c)
* Miyu Shirako
* Honoka Tsutsumi
Group play
| Pos | Teamvte | Pld | W | D | L | PF | PA | PD | Pts | Qualification |
| 1 | United States | 3 | 3 | 0 | 0 | 59 | 33 | +26 | 9 | Quarter-finals |
| 2 | Australia | 3 | 2 | 0 | 1 | 86 | 24 | +62 | 7 | Quarter-finals |
| 3 | China | 3 | 1 | 0 | 2 | 53 | 54 | −1 | 5 | Quarter-finals |
| 4 | Japan (H) | 3 | 0 | 0 | 3 | 7 | 94 | −87 | 3 | |
* 29 July 2021 (2021-07-29) 10:30
| Australia | 48–0 | Japan |
| Try: Caslick 1' c Tonegato (3) 3' m, 7' +1 m, 10' m Hayes (2) 6' c, 8' c Levi (2) 11' c, 14' m Con: Williams (3/3) 1', 6', 8' Hinds (1/2) 12' | (Tokyo 2020) | |
* Tokyo Stadium, Tokyo
* 29 July 2021 (2021-07-29) 18:00
| United States | 17–7 | Japan |
| Try: Maher 1' m Matyas 4' m Ramsey 9' c Con: Canett-Oca (0/2) Heavirland (1/1) 9' | (Tokyo 2020) | Try: Koide 13' c Con: Yamanaka (1/1) 13' |
* Tokyo Stadium, Tokyo
* 30 July 2021 (2021-07-30) 10:00
| China | 29–0 | Japan |
| Try: Xu (2) 1' c, 5' m Wang 2' c Tang 8' m Yang 13' m Con: Chen (2/4) 1', 2' Yu (0/1) | (Tokyo 2020) | |
* Tokyo Stadium, Tokyo
9–12th place playoff
* 30 July 2021 (2021-07-30) 17:00
| Kenya | 21–17 | Japan |
| Try: Okulu 3' c Omondi 7' c Atieno 14' +1 c Con: Okulu (3/3) 3', 8', 14' +1 | (Tokyo 2020) | Try: Hara 1' m Koide 8' m Kajiki 10' c Con: Yamanaka (1/3) 10' |
* Tokyo Stadium, Tokyo
11th place match
* 31 July 2021 (2021-07-31) 9:00
| Brazil | 21–12 | Japan |
| Try: Kochhann 2' c Silva 7' c Fioravanti 13' c Con: Cerullo (2/2) 2', 7' Kochhann (1/1) 13' | (Tokyo 2020) | Try: Hirotsu 3' c Hara 6' m Con: Yamanaka (1/2) 4' |
* Tokyo Stadium, Tokyo

## Sailing

As the host nation, Japan has been guaranteed one boat for each of the following classes at the Tokyo regatta, bringing the maximum quota of 15 sailors, in ten boats.
At the end of 2019 season, the Japanese Olympic Committee announced the first set of sailors to compete at the Enoshima regatta, including multiple world medalists Ai Kondo and Miho Yoshioka in the women's 470 class and three-time Olympian Makoto Tomizawa in men's windsurfing. The 49er, 49erFX, and Nacra 17 crews were added to the roster on February 15, 2020, with windsurfer Yuki Sunaga and Laser Radial sailor Manami Doi joining them two weeks later upon the completion of their respective class-associated Worlds.

### Men

| Athlete | Event | Race | Race | Race | Race | Race | Race | Race | Race | Race | Race | Race | Race | Race | Net points | Final rank |
| Athlete | Event | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | M* | Net points | Final rank |
| Makoto Tomizawa | RS:X | 10 | 21 | 11 | 16 | DNF | 14 | 17 | 11 | 11 | 16 | 11 | 11 | EL | 149 | 16 |
| Kenji Nanri | Laser | 27 | 30 | 33 | 19 | 25 | 16 | 24 | 29 | 31 | 18 | — | — | EL | 219 | 30 |
| Kazumasa Segawa | Finn | 18 | 16 | 17 | 12 | 15 | 16 | 19 | 12 | 17 | 5 | — | — | EL | 128 | 16 |
| Jumpei Hokazono Keiju Okada | 470 | 7 | 4 | 4 | 11 | 13 | 9 | 5 | 4 | 15 | 13 | — | — | 12 | 82 | 7 |
| Ibuki Koizumi Leonard Takahashi | 49er | 17 | 11 | 13 | 11 | 15 | 11 | 4 | 12 | 4 | 8 | 3 | 16 | EL | 108 | 11 |

### Women

| Athlete | Event | Race | Race | Race | Race | Race | Race | Race | Race | Race | Race | Race | Race | Race | Net points | Final rank |
| Athlete | Event | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | M* | Net points | Final rank |
| Yuki Sunaga | RS:X | 17 | 24 | 11 | 3 | 5 | 12 | 11 | 22 | 10 | 7 | 14 | 17 | EL | 129 | 12 |
| Manami Doi | Laser Radial | 16 | 9 | 10 | 23 | 11 | 28 | 15 | 16 | 13 | 17 | — | — | EL | 130 | 15 |
| Ai Kondo Miho Yoshioka | 470 | 6 | 7 | 11 | 15 | 2 | 2 | 12 | 8 | 7 | 8 | — | — | 16 | 79 | 7 |
| Sena Takano Anna Yamazaki | 49erFX | 7 | 16 | UFD | 17 | 16 | UFD | 9 | 19 | 11 | 4 | 13 | 15 | EL | 149 | 18 |

### Mixed

| Athlete | Event | Race | Race | Race | Race | Race | Race | Race | Race | Race | Race | Race | Race | Race | Net points | Final rank |
| Athlete | Event | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | M* | Net points | Final rank |
| Shibuki Iitsuka Eri Hatayama | Nacra 17 | 12 | 18 | 15 | 12 | 15 | 16 | 14 | 6 | 14 | 19 | 15 | 13 | EL | 150 | 15 |
M = Medal race; EL = Eliminated – did not advance into the medal race

## Shooting

As the host nation, Japan has been guaranteed a minimum of twelve quota places with one in each of the individual events. Additionally, a shooter qualified for one event may compete in others without affecting the quotas, as long as they obtained a minimum qualifying score (MQS) by 30 April 2020.

### Men

| Athlete | Event | Qualification | Qualification | Final | Final |
| Athlete | Event | Points | Rank | Points | Rank |
| Kojiro Horimizu | 10 m air pistol | 576 | 15 | Did not advance | Did not advance |
| Hiroyuki Ikawa | Skeet | 114 | 27 | Did not advance | Did not advance |
| Takayuki Matsumoto | 10 m air rifle | 621.7 | 37 | Did not advance | Did not advance |
| Takayuki Matsumoto | 50 m rifle 3 positions | 1145 | 37 | Did not advance | Did not advance |
| Naoya Okada | 10 m air rifle | 625.7 | 20 | Did not advance | Did not advance |
| Naoya Okada | 50 m rifle 3 positions | 1158 | 31 | Did not advance | Did not advance |
| Shigetaka Oyama | Trap | 115 | 29 | Did not advance | Did not advance |
| Dai Yoshioka | 25 m rapid fire pistol | 582 | 8 | Did not advance | Did not advance |

### Women

| Athlete | Event | Qualification | Qualification | Final | Final |
| Athlete | Event | Points | Rank | Points | Rank |
| Shiori Hirata | 10 m air rifle | 622.1 | 34 | Did not advance | Did not advance |
| Shiori Hirata | 50 m rifle 3 positions | 1169 | 11 | Did not advance | Did not advance |
| Naoko Ishihara | Skeet | 114 | 21 | Did not advance | Did not advance |
| Haruka Nakaguchi | 10 m air rifle | 622.2 | 32 | Did not advance | Did not advance |
| Yukie Nakayama | Trap | 115 | 19 | Did not advance | Did not advance |
| Chizuru Sasaki | 10 m air pistol | 556 | 50 | Did not advance | Did not advance |
| Chizuru Sasaki | 25 m pistol | 567 | 40 | Did not advance | Did not advance |
| Satoko Yamada | 10 m air pistol | 570 | 23 | Did not advance | Did not advance |
| Satoko Yamada | 25 m pistol | 563 | 43 | Did not advance | Did not advance |

### Mixed

| Athlete | Event | Qualification | Qualification | Semifinal | Semifinal | Final / BM | Final / BM |
| Athlete | Event | Points | Rank | Points | Rank | Points | Rank |
| Takayuki Matsumoto Shiori Hirata | 10 m air rifle team | 620.3 | 26 | Did not advance | Did not advance | Did not advance | Did not advance |
| Naoya Okada Haruka Nakaguchi | 10 m air rifle team | 625.6 | 13 | Did not advance | Did not advance | Did not advance | Did not advance |
| Kojiro Horimizu Satoko Yamada | 10 m air pistol team | 559 | 20 | Did not advance | Did not advance | Did not advance | Did not advance |
| Shigetaka Oyama Yukie Nakayama | Trap team | 145 | 5 | Did not advance | Did not advance | Did not advance | Did not advance |

## Skateboarding

Japan qualified ten skateboarder into the olympic competition. Six skateboarder (two men and three women) qualified after being ranked in top 16 based on the Olympic World Skateboarding Rankings List of 30 June 2021, and four skateboarder in men's and women's park events after winning the gold, silver and bronze medal at 2021 Street Skateboarding World Championships in Rome, Italy.

### Men

| Athlete | Event | Qualification | Qualification | Final | Final |
| Athlete | Event | Points | Rank | Points | Rank |
| Ayumu Hirano | Park | 62.03 | 14 | Did not advance | Did not advance |
| Yukito Aoki | Street | 18.60 | 17 | Did not advance | Did not advance |
| Yuto Horigome | Street | 33.75 | 6 Q | 37.18 | |
| Sora Shirai | Street | 31.52 | 9 | Did not advance | Did not advance |

### Women

| Athlete | Event | Qualification | Qualification | Final | Final |
| Athlete | Event | Points | Rank | Points | Rank |
| Kokona Hiraki | Park | 52.46 | 3 Q | 59.04 | |
| Misugu Okamoto | Park | 58.51 | 1 Q | 53.58 | 4 |
| Sakura Yosozumi | Park | 45.98 | 4 Q | 60.09 | |
| Funa Nakayama | Street | 15.77 | 1 Q | 14.49 | |
| Aori Nishimura | Street | 12.82 | 5 Q | 6.92 | 8 |
| Momiji Nishiya | Street | 15.40 | 2 Q | 15.26 | |

## Softball

Japan women's national softball team automatically qualified for the Olympics as the host nation.
Summary Legend: W – Win L – Lose D – Draw
| Team | Event | Round robin | Round robin | Round robin | Round robin | Round robin | Round robin | GM / BM | GM / BM |
| Team | Event | Opposition Result | Opposition Result | Opposition Result | Opposition Result | Opposition Result | Rank | Opposition Result | Rank |
| Japan women's | Women's tournament | Australia W 8–1 | Mexico W 3–2 | Italy W 5–0 | Canada W 1–0 | United States L 1–2 | 2 Q | United States W 2–0 | |
Team roster The roster was released on 23 March 2021.
Group play
| Pos | Teamvte | Pld | W | L | RF | RA | RD | PCT | GB | Qualification |
| 1 | United States | 5 | 5 | 0 | 9 | 2 | +7 | 1.000 | — | Gold medal match |
| 2 | Japan (H) | 5 | 4 | 1 | 18 | 5 | +13 | .800 | 1 | Gold medal match |
| 3 | Canada | 5 | 3 | 2 | 19 | 4 | +15 | .600 | 2 | Bronze medal match |
| 4 | Mexico | 5 | 2 | 3 | 11 | 10 | +1 | .400 | 3 | Bronze medal match |
| 5 | Australia | 5 | 1 | 4 | 5 | 21 | −16 | .200 | 4 | |
| 6 | Italy | 5 | 0 | 5 | 1 | 21 | −20 | .000 | 5 | |
21 July 08:55 (JST) Fukushima Azuma Baseball Stadium 31 °C (88 °F) :
| Team | 1 | 2 | 3 | 4 | 5 | 6 | 7 | R | H | E |
| Australia | 1 | 0 | 0 | 0 | 0 | X | X | 1 | 2 | 2 |
| Japan (5) | 1 | 0 | 2 | 3 | 2 | X | X | 8 | 6 | 0 |
| WP: Yukiko Ueno (1–0) LP: Kaia Parnaby (0–1) Home runs: AUS: None JPN: Minori Naito (1), Yamato Fujita (1), Yu Yamamoto (1) Boxscore |||||||||||
22 July 12:00 (JST) Fukushima Azuma Baseball Stadium 28 °C (82 °F) :
| Team | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | R | H | E |
| Mexico | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 2 | 6 | 0 |
| Japan (8) | 0 | 1 | 0 | 0 | 1 | 0 | 0 | 1 | 3 | 5 | 0 |
| WP: Miu Goto (1–0) LP: Danielle O'Toole (0–1) Home runs: MEX: Anissa Urtez (1) JPN: Yamato Fujita (2) Boxscore ||||||||||||
24 July 20:00 (JST) Yokohama Stadium 28 °C (82 °F) :
| Team | 1 | 2 | 3 | 4 | 5 | 6 | 7 | R | H | E |
| Japan | 0 | 0 | 0 | 2 | 0 | 3 | 0 | 5 | 6 | 0 |
| Italy | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 0 |
| WP: Miu Goto (2–0) LP: Alexia Lacatena (0–1) Home runs: JPN: Yu Yamamoto (2), Yamato Fujita (3) ITA: None Boxscore |||||||||||
25 July 14:30 (JST) Yokohama Stadium 33 °C (91 °F) :
| Team | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | R | H | E |
| Canada | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 4 | 1 |
| Japan (8) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 6 | 0 |
| WP: Miu Goto (3–0) LP: Danielle Lawrie (0–1) Boxscore ||||||||||||
26 July 10:00 (JST) Yokohama Stadium 29 °C (84 °F) :
| Team | 1 | 2 | 3 | 4 | 5 | 6 | 7 | R | H | E |
| Japan | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 4 | 0 |
| United States | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 2 | 4 | 1 |
| WP: Monica Abbott (3–0) LP: Yamato Fujita (0–1) Home runs: JPN: None USA: Kelsey Stewart (1) Boxscore |||||||||||
Gold medal match
27 July 20:00 (JST) Yokohama Stadium :
| Team | 1 | 2 | 3 | 4 | 5 | 6 | 7 | R | H | E |
| Japan | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 2 | 8 | 0 |
| United States | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 0 |
| WP: Yukiko Ueno (2–0) LP: Ally Carda (0–1) Boxscore |||||||||||

## Sport climbing

Japan, as the host nation, received a guaranteed place each in the gender-based combined events, unless a maximum of two men and two women were selected to the team based on competition results.
Tomoa Narasaki and Akiyo Noguchi booked their spots on the host nation's team, with a successful podium finish each (gold for Narasaki and silver for Noguchi) in the men's and women's combined event at the 2019 IFSC World Championships in Hachioji. In November 2019, the International Sport Climbing Association (IFSC) and the Japan Mountaineering and Sport Climbing Association (JMSCA) confirmed Kai Harada and Miho Nonaka as Olympic-qualified sport climbers, occupying a place each reserved for the host nation in their respective events.
| Athlete | Event | Qualification | Qualification | Qualification | Qualification | Qualification | Qualification | Qualification | Qualification | Qualification | Final | Final | Final | Final | Final | Final | Final | Final | Final |
| Athlete | Event | Speed | Speed | Boulder | Boulder | Lead | Lead | Lead | Total | Rank | Speed | Speed | Boulder | Boulder | Lead | Lead | Lead | Total | Rank |
| Athlete | Event | Best | Place | Result | Place | Hold | Time | Place | Total | Rank | Best | Place | Result | Place | Hold | Time | Place | Total | Rank |
| Kai Harada | Men's | 7.08 | 15 | 1T2z 4 8 | 12 | 25+ | – | 17 | 3060.00 | 18 | did not advance | did not advance | did not advance | did not advance | did not advance | did not advance | did not advance | did not advance | did not advance |
| Tomoa Narasaki | Men's | 5.94 | 2 | 2T4z 6 7 | 2 | 26+ | 2:11 | 14 | 56.00 | 2 Q | 6.02 | 2 | 1T3z 1 5 | 3 | 33+ | – | 6 | 36 | 4 |
| Akiyo Noguchi | Women's | 8.23 | 9 | 3T4z 5 4 | 3 | 27+ | – | 6 | 162.00 | 4 Q | 8.42 | 4 | 0T2z 0 7 | 4 | 29+ | – | 4 | 64 | |
| Miho Nonaka | Women's | 7.55 | 4 | 1T3z 2 3 | 8 | 30+ | – | 3 | 96.00 | 3 Q | 7.76 | 3 | 0T2z 0 5 | 3 | 21 | – | 5 | 45 | |

## Surfing

Japan sent four surfers (two men and two women) to compete in their respective shortboard races at the Games. Hiroto Ohhara and Shino Matsuda secured a qualification slot each for their nation, as the highest-ranked at the 2021 ISA World Surfing Games in El Sunzal and La Bocana. Meanwhile, American-born Kanoa Igarashi finished within the top ten of those eligible for qualification in the World Surf League rankings to join Murakami and Matsuda on the host nation's roster.
| Athlete | Event | Round 1 | Round 1 | Round 2 | Round 2 | Round 3 | Quarterfinals | Semifinals | Final / BM | Final / BM |
| Athlete | Event | Points | Rank | Points | Rank | Opposition Result | Opposition Result | Opposition Result | Opposition Result | Rank |
| Kanoa Igarashi | Men's shortboard | 12.77 | 1 Q | Bye | Bye | Waida (INA) W 14.00–12.00 | Andino (USA) W 12.60–11.00 | Medina (BRA) W 17.00–16.76 | Ferreira (BRA) L 6.60–15.14 | |
| Hiroto Ohhara | Men's shortboard | 11.40 | 2 Q | Bye | Bye | Tudela (PER) W 10.00–9.63 | Ferreira (BRA) L 11.90–16.30 | Did not advance | Did not advance | Did not advance |
| Mahina Maeda | Women's shortboard | 9.20 | 4 q | 9.63 | 3 Q | Marks (USA) L 7.34–15.33 | Did not advance | Did not advance | Did not advance | Did not advance |
| Amuro Tsuzuki | Women's shortboard | 6.99 | 4 q | 11.60 | 1 Q | Weston-Webb (BRA) W 10.33–9.00 | Fitzgibbons (AUS) W 13.27–11.67 | Moore (USA) L 7.43–8.33 | Marks (USA) W 6.80–4.26 | |

## Swimming

Japanese swimmers further achieved qualifying standards in the following events (up to a maximum of 2 swimmers in each event at the Olympic Qualifying Time (OQT), and potentially 1 at the Olympic Selection Time (OST)): To assure their selection to the Olympic team, swimmers must finish in the top two of each individual event under both the federation's required standard and a FINA-A qualifying cut at the Japanese Championships and Olympic Trials (April 3 to 10) in Tokyo.
By winning individual gold medals in the medley double (200 and 400) at the 2019 FINA World Championships, Daiya Seto became the first Japanese swimmer to be directly selected to the Olympic team for Tokyo 2020. Thirty-two more swimmers were named for the home-based Games at the end of the Japanese Championships and Olympic Trials, including backstroke veteran and double silver medalist Ryosuke Irie, leukemia survivor, freestyle, and butterfly sprinter Rikako Ikee, and the reigning Olympic champion in the individual medley Kosuke Hagino. For Irie, he became the third Japanese swimmer to compete in fourth consecutive Olympics, tying the record with Kosuke Kitajima and Takeshi Matsuda for the most appearances.

### Men

| Athlete | Event | Heat | Heat | Semifinal | Semifinal | Final | Final |
| Athlete | Event | Time | Rank | Time | Rank | Time | Rank |
| Kosuke Hagino | 200 m individual medley | 1:57.39 | =5 Q | 1:57.47 | 6 Q | 1:57.49 | 6 |
| Tomoru Honda | 200 m butterfly | 1:55.10 | 6 Q | 1:55.31 | 8 Q | 1:53.73 | |
| Yuki Ikari | 400 m individual medley | 4:12.08 | 11 | — | — | Did not advance | Did not advance |
| Ryosuke Irie | 100 m backstroke | 52.99 | 5 Q | 53.21 | =9 | Did not advance | Did not advance |
| Ryosuke Irie | 200 m backstroke | 1:56.97 | 8 Q | 1:56.69 | 8 Q | 1:57.32 | 7 |
| Takeshi Kawamoto | 100 m butterfly | 51.93 | 20 | Did not advance | Did not advance | Did not advance | Did not advance |
| Katsuhiro Matsumoto | 200 m freestyle | 1:46.69 | =17 | Did not advance | Did not advance | Did not advance | Did not advance |
| Taishin Minamide | 10 km open water | — | — | — | — | 1:53:07.5 | 13 |
| Naoki Mizunuma | 100 m butterfly | 51.57 | =12 Q | 51.46 | 10 | Did not advance | Did not advance |
| Ryuya Mura | 100 m breaststroke | 59.40 | 11 Q | 59.82 | =13 | Did not advance | Did not advance |
| Ryuya Mura | 200 m breaststroke | 2:09.00 | 8 Q | 2:08.27 | 6 Q | 2:08.42 | 7 |
| Katsumi Nakamura | 100 m freestyle | 48.48 | 17 | Did not advance | Did not advance | Did not advance | Did not advance |
| Shoma Sato | 100 m breaststroke | 1:00.04 | 23 | Did not advance | Did not advance | Did not advance | Did not advance |
| Shoma Sato | 200 m breaststroke | 2:09.43 | 11 Q | 2:09.04 | 10 | Did not advance | Did not advance |
| Daiya Seto | 200 m butterfly | 1:55.26 | 9 Q | 1:55.50 | 11 | Did not advance | Did not advance |
| Daiya Seto | 200 m individual medley | 1:58.15 | 16 Q | 1:56.86 | 3 Q | 1:56.22 | 4 |
| Daiya Seto | 400 m individual medley | 4:10.52 | 9 | — | — | Did not advance | Did not advance |
| Keita Sunama | 200 m backstroke | 1:57.07 | 9 Q | 1:57.16 | 14 | Did not advance | Did not advance |
| Katsumi Nakamura Akira Namba Kaiya Seki Shinri Shioura | 4 × 100 m freestyle relay | 3:14.44 | 14 | — | — | Did not advance | Did not advance |
| Kosuke Hagino Katsuhiro Matsumoto Kotaro Takahashi Konosuke Yanagimoto | 4 × 200 m freestyle relay | 7:09.53 | 12 | — | — | Did not advance | Did not advance |
| Ryosuke Irie Naoki Mizunuma Ryuya Mura Katsumi Nakamura | 4 × 100 m medley relay | 3:32.02 | 5 Q | — | — | 3:29.91 AS | 6 |

### Women

| Athlete | Event | Heat | Heat | Semifinal | Semifinal | Final | Final |
| Athlete | Event | Time | Rank | Time | Rank | Time | Rank |
| Reona Aoki | 100 m breaststroke | 1:07.29 | 19 | Did not advance | Did not advance | Did not advance | Did not advance |
| Suzuka Hasegawa | 200 m butterfly | 2:10.43 | 13 Q | 2:09.42 | 9 | Did not advance | Did not advance |
| Yumi Kida | 10 km open water | — | — | — | — | 2:01:40.9 | 13 |
| Waka Kobori | 400 m freestyle | 4:05.57 | 11 | — | — | Did not advance | Did not advance |
| Waka Kobori | 800 m freestyle | 8:28.90 | 16 | — | — | Did not advance | Did not advance |
| Anna Konishi | 100 m backstroke | 1:00.04 | 16 Q | 1:00.07 | 13 | Did not advance | Did not advance |
| Miyu Namba | 400 m freestyle | 4:13.49 | 20 | — | — | Did not advance | Did not advance |
| Miyu Namba | 800 m freestyle | 8:32.04 | 17 | — | — | Did not advance | Did not advance |
| Yui Ohashi | 200 m individual medley | 2:10.77 | 10 Q | 2:09.79 | 5 Q | 2:08.52 | |
| Yui Ohashi | 400 m individual medley | 4:35.71 | 3 Q | — | — | 4:32.08 | |
| Ageha Tanigawa | 400 m individual medley | 4:41.76 | 12 | — | — | Did not advance | Did not advance |
| Miho Teramura | 200 m individual medley | 2:11.22 | 12 Q | 2:12.14 | 15 | Did not advance | Did not advance |
| Kanako Watanabe | 100 m breaststroke | 1:07.01 | 17 | Did not advance | Did not advance | Did not advance | Did not advance |
| Kanako Watanabe | 200 m breaststroke | 2:24.73 | 18 | Did not advance | Did not advance | Did not advance | Did not advance |
| Chihiro Igarashi Rikako Ikee Rika Omoto Natsumi Sakai | 4 × 100 m freestyle relay | 3:36.20 | 9 | — | — | Did not advance | Did not advance |
| Chihiro Igarashi Nagisa Ikemoto Aoi Masuda Rio Shirai | 4 × 200 m freestyle relay | 7:58.39 | 9 | — | — | Did not advance | Did not advance |
| Chihiro Igarashi Rikako Ikee Anna Konishi Kanako Watanabe | 4 × 100 m medley relay | 3:57.17 | 6 Q | — | — | 3:58.12 | 8 |

### Mixed

| Athlete | Event | Heat | Heat | Final | Final |
| Athlete | Event | Time | Rank | Time | Rank |
| Rikako Ikee Anna Konishi Katsuhiro Matsumoto Shoma Sato | 4 × 100 m medley relay | 3:44.15 | 9 | Did not advance | Did not advance |

## Table tennis

Japan entered six athletes into the table tennis competition at the Games, as the host nation was automatically entitled to use quota places each in the men's and women's teams. Moreover, an additional berth was awarded to the Japanese table tennis players competing in the inaugural mixed doubles by advancing to the semifinal stage of the 2019 ITTF World Tour Grand Finals in Zhengzhou.
The host nation's table tennis players were officially named on January 6, 2020, with Rio 2016 bronze medalist Jun Mizutani participating in his fourth straight Games.

### Men

| Athlete | Event | Preliminary | Round 1 | Round 2 | Round 3 | Round of 16 | Quarterfinals | Semifinals | Final / BM | Final / BM |
| Athlete | Event | Opposition Result | Opposition Result | Opposition Result | Opposition Result | Opposition Result | Opposition Result | Opposition Result | Opposition Result | Rank |
| Tomokazu Harimoto | Singles | Bye | Bye | Bye | Lam (HKG) W 4–1 | Jorgić (SLO) L 3–4 | Did not advance | Did not advance | Did not advance | Did not advance |
| Koki Niwa | Singles | Bye | Bye | Bye | Wang (SVK) W 4–0 | Ovtcharov (GER) L 1–4 | Did not advance | Did not advance | Did not advance | Did not advance |
| Tomokazu Harimoto Jun Mizutani Koki Niwa | Team | — | — | — | — | Australia (AUS) W 3–0 | Sweden (SWE) W 3–1 | Germany (GER) L 2–3 | South Korea (KOR) W 3–1 | |

### Women

| Athlete | Event | Preliminary | Round 1 | Round 2 | Round 3 | Round of 16 | Quarterfinals | Semifinals | Final / BM | Final / BM |
| Athlete | Event | Opposition Result | Opposition Result | Opposition Result | Opposition Result | Opposition Result | Opposition Result | Opposition Result | Opposition Result | Rank |
| Kasumi Ishikawa | Singles | Bye | Bye | Bye | Paranang (THA) W 4–2 | Polcanova (AUT) W 4–0 | Yu My (SGP) L 1–4 | Did not advance | Did not advance | Did not advance |
| Mima Ito | Singles | Bye | Bye | Bye | Yu (POR) W 4–1 | Sawettabut (THA) W 4–0 | Jeon J-h (KOR) W 4–0 | Sun Ys (CHN) L 0–4 | Yu My (SGP) W 4–1 | |
| Miu Hirano Kasumi Ishikawa Mima Ito | Team | — | — | — | — | Hungary (HUN) W 3–0 | Chinese Taipei (TPE) W 3–0 | Hong Kong (HKG) W 3–0 | China (CHN) L 0–3 | |

### Mixed

| Athlete | Event | Round of 16 | Quarterfinals | Semifinals | Final / BM | Final / BM |
| Athlete | Event | Opposition Result | Opposition Result | Opposition Result | Opposition Result | Rank |
| Jun Mizutani Mima Ito | Doubles | Fegerl / Polcanova (AUT) W 4–1 | Franziska / Solja (GER) W 4–3 | Lin Y-j / Cheng I-c (TPE) W 4–1 | Xu X / Liu Sw (CHN) W 4–3 | |

## Taekwondo

As the host nation, Japanese taekwondo practitioners have already received four quota places, two men and two women, at their disposal for the Games. On 9 February 2020, the Japanese Olympic Committee nominated the four athletes to take up the host nation places, with Mayu Hamada (women's 57 kg) leading them to her third consecutive Games.
| Athlete | Event | Qualification | Round of 16 | Quarterfinals | Semifinals | Repechage 1 | Repechage 2 | Final / BM | Final / BM |
| Athlete | Event | Opposition Result | Opposition Result | Opposition Result | Opposition Result | Opposition Result | Opposition Result | Opposition Result | Rank |
| Sergio Suzuki | Men's −58 kg | — | Demse (ETH) L 2–22 | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance |
| Ricardo Suzuki | Men's −68 kg | Bye | Husić (BIH) L 2–22 | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance |
| Miyu Yamada | Women's −49 kg | Bye | Su P-y (TPE) W 10–9 | Sim J-y (KOR) W 16–7 | Wongpattanakit (THA) L 12–34 PTG | — | Bye | Bogdanović (SRB) L 6–20 | 5 |
| Mayu Hamada | Women's −57 kg | Bye | Ben Yessouf (NIG) L 6–11 | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance |

## Tennis
### Men

| Athlete | Event | Round of 64 | Round of 32 | Round of 16 | Quarterfinals | Semifinals | Final / BM | Final / BM |
| Athlete | Event | Opposition Score | Opposition Score | Opposition Score | Opposition Score | Opposition Score | Opposition Score | Rank |
| Taro Daniel | Singles | Sonego (ITA) L 6–4, 6–7$^{(6–8)}$, 6–7$^{(3–7)}$ | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance |
| Kei Nishikori | Singles | Rublev (ROC) W 6–3, 6–4 | Giron (USA) W 7–6, 3–6, 6–1 | Ivashka (BLR) W 7–6$^{(9–7)}$, 6–0 | Djokovic (SRB) L 2–6, 0–6 | Did not advance | Did not advance | Did not advance |
| Yoshihito Nishioka | Singles | Khachanov (ROC) L 6–3, 1–6, 2–6 | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance |
| Yūichi Sugita | Singles | Fognini (ITA) L 4–6, 3–6 | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance |
| Taro Daniel Yoshihito Nishioka | Doubles | — | Čilić / Dodig (CRO) L 2–6, 4–6 | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance |
| Ben McLachlan Kei Nishikori | Doubles | — | Sousa / Sousa (POR) W 6–1, 6–4 | Murray / Skupski (GBR) W 6–3, 6–4 | Mektić / Pavić (CRO) L 3–6, 3–6 | Did not advance | Did not advance | Did not advance |

### Women

| Athlete | Event | Round of 64 | Round of 32 | Round of 16 | Quarterfinals | Semifinals | Final / BM | Final / BM |
| Athlete | Event | Opposition Score | Opposition Score | Opposition Score | Opposition Score | Opposition Score | Opposition Score | Rank |
| Misaki Doi | Singles | Zarazúa (MEX) W 6–3, 6–2 | Bencic (SUI) L 2–6, 4–6 | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance |
| Nao Hibino | Singles | Stojanović (SRB) L 3–6, 3–6 | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance |
| Naomi Osaka | Singles | Zheng Ss (CHN) W 6–1, 6–4 | Golubic (SUI) W 6–3, 6–2 | Vondroušová (CZE) L 1–6, 4–6 | Did not advance | Did not advance | Did not advance | Did not advance |
| Shuko Aoyama Ena Shibahara | Doubles | — | Bencic / Golubic (SUI) L 4–6, 7–6$^{(7–5)}$, [5–10] | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance |
| Nao Hibino Makoto Ninomiya | Doubles | — | Barty / Sanders (AUS) L 1–6, 2–6 | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance |

### Mixed

| Athlete | Event | Round of 16 | Quarterfinals | Semifinals | Final / BM | Final / BM |
| Athlete | Event | Opposition Score | Opposition Score | Opposition Score | Opposition Score | Rank |
| Ena Shibahara Ben McLachlan | Doubles | Shvedova / Golubev (KAZ) W 6–3, 7–6$^{(7–3)}$ | Pavlyuchenkova / Rublev (ROC) L 5–7, 7–6$^{(7–0)}$, [8–10] | Did not advance | Did not advance | Did not advance |

## Triathlon

As the host nation, Japan reserves four quota places with two for each gender in the individual and mixed relay triathlon events.

### Individual

| Athlete | Event | Time | Time | Time | Time | Time | Time | Rank |
| Athlete | Event | Swim (1.5 km) | Trans 1 | Bike (40 km) | Trans 2 | Run (10 km) | Total | Rank |
| Kenji Nener | Men's | 17:51 | 0:41 | 56:31 | 0:28 | 30:53 | 1:46:24 | 14 |
| Makoto Odakura | Men's | 18:21 | 0:41 | 56:05 | 0:30 | 31:26 | 1:47:03 | 19 |
| Niina Kishimoto | Women's | 19:48 | 0:42 | Did not finish | Did not finish | Did not finish | Did not finish | Did not finish |
| Yuko Takahashi | Women's | 19:10 | 0:42 | 1:03:15 | 0:31 | 37:40 | 2:01:18 | 18 |

### Relay

| Athlete | Event | Time | Time | Time | Time | Time | Time | Rank |
| Athlete | Event | Swim (300 m) | Trans 1 | Bike (7 km) | Trans 2 | Run (2 km) | Total group | Rank |
| Kenji Nener | Mixed relay | 4:03 | 0:35 | 9:36 | 0:28 | 5:48 | 20:30 | — |
| Makoto Odakura | Mixed relay | 4:11 | 0:38 | 10:19 | 0:29 | 6:01 | 21:38 | — |
| Niina Kishimoto | Mixed relay | 4:32 | 0:39 | 10:22 | 0:30 | 6:54 | 22:57 | — |
| Yuko Takahashi | Mixed relay | 3:52 | 0:40 | 10:31 | 0:28 | 6:26 | 21:57 | — |
| Total | Mixed relay | — | — | — | — | — | 1:24:40 | 6 |

## Volleyball
### Beach

As the host nation, Japan received a guaranteed place for each gender.
| Athlete | Event | Preliminary round | Preliminary round | Preliminary round | Preliminary round | Repechage | Round of 16 | Quarterfinals | Semifinals | Final / BM | Final / BM |
| Athlete | Event | Opposition Score | Opposition Score | Opposition Score | Rank | Opposition Score | Opposition Score | Opposition Score | Opposition Score | Opposition Score | Rank |
| Yusuke Ishijima Katsuhiro Shiratori | Men's | Kantor / Łosiak (POL) L(15–21, 14–21) | Lupo / Nicolai (ITA) L (19–21, 16–21) | Thole / Wickler (GER) L (16–21, 11–21) | 4 | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance |
| Miki Ishii Megumi Murakami | Women's | Hermannová / Sluková (CZE) W (21–0, 21–0) | Kozuch / Ludwig (GER) L (17–21, 20–22) | Betschart / Hüberli (SUI) L (21–14, 19–21, 12–15) | 3 q | Baquerizo / Fernández (ESP) L (15–21, 10–21) | Did not advance | Did not advance | Did not advance | Did not advance | Did not advance |

### Indoor

Summary
| Team | Event | Group stage | Group stage | Group stage | Group stage | Group stage | Group stage | Quarter-finals | Semi-finals | GM / BM | GM / BM |
| Team | Event | Opposition Score | Opposition Score | Opposition Score | Opposition Score | Opposition Score | Rank | Opposition Score | Opposition Score | Opposition Score | Rank |
| Japan men's | Men's tournament | Venezuela W 3–0 | Canada W 3–1 | Italy L 1–3 | Poland L 0–3 | Iran W 3–2 | 3 Q | Brazil L 0–3 | Did not advance | Did not advance | Did not advance |
| Japan women's | Women's tournament | Kenya W 3–0 | Serbia L 0–3 | Brazil L 0–3 | South Korea L 2–3 | Dominican Republic L 1–3 | 5 | Did not advance | Did not advance | Did not advance | Did not advance |

#### Men's tournament

Japan men's volleyball team automatically qualified for the Olympics as the host nation.
Team roster The Japan roster was announced on 21 June 2021.
Head coach: Yuichi Nakagaichi
* 1 Kunihiro Shimizu OP
* 2 Taishi Onodera MB
* 3 Naonobu Fujii S
* 6 Akihiro Yamauchi MB
* 11 Yuji Nishida OP
* 12 Masahiro Sekita S
* 14 Yūki Ishikawa (C) OH
* 15 Haku Ri MB
* 17 Kenta Takanashi OH
* 19 Tatsunori Otsuka OH
* 20 Tomohiro Yamamoto L
* 21 Ran Takahashi OH
Group play
| Pos | Teamvte | Pld | W | L | Pts | SW | SL | SR | SPW | SPL | SPR | Qualification |
| 1 | Poland | 5 | 4 | 1 | 13 | 14 | 4 | 3.500 | 435 | 365 | 1.192 | Quarterfinals |
| 2 | Italy | 5 | 4 | 1 | 11 | 12 | 7 | 1.714 | 447 | 411 | 1.088 | Quarterfinals |
| 3 | Japan (H) | 5 | 3 | 2 | 8 | 10 | 9 | 1.111 | 437 | 433 | 1.009 | Quarterfinals |
| 4 | Canada | 5 | 2 | 3 | 7 | 9 | 9 | 1.000 | 396 | 387 | 1.023 | Quarterfinals |
| 5 | Iran | 5 | 2 | 3 | 6 | 9 | 11 | 0.818 | 453 | 460 | 0.985 | |
| 6 | Venezuela | 5 | 0 | 5 | 0 | 1 | 15 | 0.067 | 281 | 393 | 0.715 | |
Quarterfinal

#### Women's tournament

Japan women's volleyball team automatically qualified for the Olympics as the host nation.
Team roster The roster was announced 30 June 2021.
Head coach: Kumi Nakada
* 1 Ai Kurogo OS
* 2 Sarina Koga OS
* 3 Kanami Tashiro S
* 4 Mayu Ishikawa OS
* 5 Haruyo Shimamura MB
* 6 Mako Kobata L
* 8 Yuki Ishii OS
* 9 Mai Okumura MB
* 11 Erika Araki (c) MB
* 12 Aki Momii S
* 15 Kotona Hayashi OS
* 19 Nichika Yamada MB
Group play
| Pos | Teamvte | Pld | W | L | Pts | SW | SL | SR | SPW | SPL | SPR | Qualification |
| 1 | Brazil | 5 | 5 | 0 | 14 | 15 | 3 | 5.000 | 434 | 315 | 1.378 | Quarter-finals |
| 2 | Serbia | 5 | 4 | 1 | 12 | 13 | 3 | 4.333 | 381 | 313 | 1.217 | Quarter-finals |
| 3 | South Korea | 5 | 3 | 2 | 7 | 9 | 10 | 0.900 | 374 | 415 | 0.901 | Quarter-finals |
| 4 | Dominican Republic | 5 | 2 | 3 | 8 | 10 | 10 | 1.000 | 411 | 406 | 1.012 | Quarter-finals |
| 5 | Japan (H) | 5 | 1 | 4 | 4 | 6 | 12 | 0.500 | 378 | 395 | 0.957 | |
| 6 | Kenya | 5 | 0 | 5 | 0 | 0 | 15 | 0.000 | 242 | 376 | 0.644 | |

## Water polo

Summary
* FT – After full time.
* P – Match decided by penalty-shootout.
| Team | Event | Group stage | Group stage | Group stage | Group stage | Group stage | Group stage | Quarter-finals | Semi-finals | GM / BM | GM / BM |
| Team | Event | Opposition Score | Opposition Score | Opposition Score | Opposition Score | Opposition Score | Rank | Opposition Score | Opposition Score | Opposition Score | Rank |
| Japan men's | Men's tournament | United States L 13–15 | Hungary L 11–16 | Greece L 9–10 | Italy L 8–16 | South Africa W 24–9 | 5 | Did not advance | Did not advance | Did not advance | Did not advance |
| Japan women's | Women's tournament | United States L 4–25 | China L 11–16 | Hungary L 13–17 | Russia L 16–20 | — | 5 | Did not advance | Did not advance | Did not advance | Did not advance |

### Men's tournament

Japan men's water polo team automatically qualified for the Olympics as the host nation.
Team roster Japan's final squad was announced on 19 May 2021.
Head coach: Yoji Omoto
| No. | Player | Pos. | L/R | Height | Weight | Date of birth (age) | Apps | OG/ Goals | Club |
| 1 | Katsuyuki Tanamura | 10GK | 2R | 1.83 m (6 ft 0 in) | 86 kg (190 lb) | (1989-08-03)3 August 1989 (aged 31) | 142 | 1/0 | Bourbon |
| 2 | Seiya Adachi | 50D | 2R | 1.72 m (5 ft 8 in) | 76 kg (168 lb) | (1995-06-24)24 June 1995 (aged 26) | 48 | 1/1 | CSM Digi Oradea |
| 3 | Harukiirario Koppu | 20CB | 2R | 1.84 m (6 ft 0 in) | 84 kg (185 lb) | (1998-12-28)28 December 1998 (aged 22) | 141 | 0/0 | DSK Dragons |
| 4 | Mitsuaki Shiga | 50D | 2R | 1.77 m (5 ft 10 in) | 76 kg (168 lb) | (1991-09-16)16 September 1991 (aged 29) | 136 | 1/3 | Kingfisher74 |
| 5 | Takuma Yoshida | 50D | 2R | 1.75 m (5 ft 9 in) | 77 kg (170 lb) | (1994-10-11)11 October 1994 (aged 26) | 122 | 0/0 | Kingfisher74 |
| 6 | Toi Suzuki | 50D | 2R | 1.83 m (6 ft 0 in) | 78 kg (172 lb) | (1999-10-20)20 October 1999 (aged 21) | 112 | 0/0 | Nippon Sport |
| 7 | Yusuke Shimizu | 40CF | 1L | 1.81 m (5 ft 11 in) | 95 kg (209 lb) | (1988-09-07)7 September 1988 (aged 32) | | 1/1 | Bourbon |
| 8 | Mitsuru Takata | 50D | 2R | 1.82 m (6 ft 0 in) | 86 kg (190 lb) | (1995-12-08)8 December 1995 (aged 25) | 72 | 0/0 | Kingfisher74 |
| 9 | Atsushi Arai | 50D | 2R | 1.68 m (5 ft 6 in) | 66 kg (146 lb) | (1994-02-03)3 February 1994 (aged 27) | 18 | 1/4 | Kingfisher74 |
| 10 | Yusuke Inaba | 50D | 2R | 1.80 m (5 ft 11 in) | 79 kg (174 lb) | (2000-04-11)11 April 2000 (aged 21) | 42 | 0/0 | Bourbon |
| 11 | Keigo Okawa (C) | 50D | 2R | 1.83 m (6 ft 0 in) | 90 kg (198 lb) | (1990-03-11)11 March 1990 (aged 31) | 118 | 1/9 | Kingfisher74 |
| 12 | Kenta Araki | 40CF | 2R | 1.86 m (6 ft 1 in) | 94 kg (207 lb) | (1995-04-06)6 April 1995 (aged 26) | 18 | 0/0 | Kingfisher74 |
| 13 | Tomoyoshi Fukushima | 10GK | 2R | 1.78 m (5 ft 10 in) | 80 kg (176 lb) | (1993-06-03)3 June 1993 (aged 28) | 112 | 1/0 | Kingfisher74 |
| Average | Average | Average | Average | 1.79 m (5 ft 10 in) | 82 kg (181 lb) | 27 years, 29 days | 90 | | |
Note: Age as of 23 July 2021 Source: Japan Men | Tokyo 2020 Olympics Archived 2021-07-22 at the Wayback Machine
Group play
| Pos | Teamvte | Pld | W | D | L | GF | GA | GD | Pts | Qualification |
| 1 | Greece | 5 | 4 | 1 | 0 | 68 | 34 | +34 | 9 | Quarterfinals |
| 2 | Italy | 5 | 3 | 2 | 0 | 60 | 32 | +28 | 8 | Quarterfinals |
| 3 | Hungary | 5 | 3 | 1 | 1 | 64 | 35 | +29 | 7 | Quarterfinals |
| 4 | United States | 5 | 2 | 0 | 3 | 59 | 53 | +6 | 4 | Quarterfinals |
| 5 | Japan (H) | 5 | 1 | 0 | 4 | 65 | 66 | −1 | 2 | |
| 6 | South Africa | 5 | 0 | 0 | 5 | 20 | 116 | −96 | 0 | |
| 25 July 2021 (2021-07-25) 14:00 v | Report | United States | 15–13 | Japan | Tokyo Tatsumi International Swimming Center Referees: Sébastien Dervieux (FRA), Arkadiy Voevodin (RUS) |
| Tokyo Tatsumi International Swimming Center Referees: Sébastien Dervieux (FRA), Arkadiy Voevodin (RUS) |||
| 25 July 2021 (2021-07-25) 14:00 v | Report | Bowen 5 | Goals | three players 3 | Tokyo Tatsumi International Swimming Center Referees: Sébastien Dervieux (FRA), Arkadiy Voevodin (RUS) |
| 27 July 2021 (2021-07-27) 18:20 v | Report | Japan | 11–16 | Hungary | Tokyo Tatsumi International Swimming Center Referees: Michiel Zwart (NED), Nenad Periš (CRO) |
| Tokyo Tatsumi International Swimming Center Referees: Michiel Zwart (NED), Nenad Periš (CRO) |||
| 27 July 2021 (2021-07-27) 18:20 v | Report | Inaba, Okawa 3 | Goals | Zalánki 4 | Tokyo Tatsumi International Swimming Center Referees: Michiel Zwart (NED), Nenad Periš (CRO) |
| 29 July 2021 (2021-07-29) 18:20 v | Report | Greece | 10–9 | Japan | Tokyo Tatsumi International Swimming Center Referees: Adrian Alexandrescu (ROU), Vojin Putniković (SRB) |
| Tokyo Tatsumi International Swimming Center Referees: Adrian Alexandrescu (ROU), Vojin Putniković (SRB) |||
| 29 July 2021 (2021-07-29) 18:20 v | Report | Kapotsis, Genidounias 3 | Goals | Adachi 3 | Tokyo Tatsumi International Swimming Center Referees: Adrian Alexandrescu (ROU), Vojin Putniković (SRB) |
| 31 July 2021 (2021-07-31) 18:20 v | Report | Italy | 16–8 | Japan | Tokyo Tatsumi International Swimming Center Referees: Stanko Ivanovski (MNE), Nenad Periš (CRO) |
| Tokyo Tatsumi International Swimming Center Referees: Stanko Ivanovski (MNE), Nenad Periš (CRO) |||
| 31 July 2021 (2021-07-31) 18:20 v | Report | Bodagas, Figlioli 3 | Goals | Inaba 3 | Tokyo Tatsumi International Swimming Center Referees: Stanko Ivanovski (MNE), Nenad Periš (CRO) |
| 2 August 2021 (2021-08-02) 18:20 v | Report | Japan | 24–9 | South Africa | Tokyo Tatsumi International Swimming Center Referees: John Waldow (NZL), Vojin Putniković (SRB) |
| Tokyo Tatsumi International Swimming Center Referees: John Waldow (NZL), Vojin Putniković (SRB) |||
| 2 August 2021 (2021-08-02) 18:20 v | Report | Adachi, Arai 4 | Goals | Neill 4 | Tokyo Tatsumi International Swimming Center Referees: John Waldow (NZL), Vojin Putniković (SRB) |

### Women's tournament

Japan women's water polo team automatically qualified for the Olympics as the host nation.
Team roster Japan's final squad was announced on 19 May 2021.
Head coach: Makihiro Motomiya
| No. | Player | Pos. | L/R | Height | Weight | Date of birth (age) | Apps | OG/ Goals | Club |
| 1 | Rikako Miura | 10GK | 2R | 1.71 m (5 ft 7 in) | 61 kg (134 lb) | (1989-10-13)13 October 1989 (aged 31) | 76 | 0/0 | Nittai Club |
| 2 | Yumi Arima | 50D | 2R | 1.73 m (5 ft 8 in) | 73 kg (161 lb) | (1997-09-09)9 September 1997 (aged 23) | 45 | 0/0 | Fujimura |
| 3 | Akari Inaba | 50D | 2R | 1.64 m (5 ft 5 in) | 60 kg (132 lb) | (1998-02-02)2 February 1998 (aged 23) | 50 | 0/0 | Shumei University |
| 4 | Eruna Ura | 50D | 2R | 1.69 m (5 ft 7 in) | 61 kg (134 lb) | (2002-10-14)14 October 2002 (aged 18) | 8 | 0/0 | Shumei University |
| 5 | Kaho Iwano | 20CB | 2R | 1.66 m (5 ft 5 in) | 62 kg (137 lb) | (1999-08-06)6 August 1999 (aged 21) | 6 | 0/0 | Shumei University |
| 6 | Miku Koide | 40CF | 2R | 1.72 m (5 ft 8 in) | 78 kg (172 lb) | (1992-05-21)21 May 1992 (aged 29) | 33 | 0/0 | Bourbon |
| 7 | Maiko Hashida | 50D | 2R | 1.64 m (5 ft 5 in) | 58 kg (128 lb) | (2000-12-23)23 December 2000 (aged 20) | 28 | 0/0 | Nippon Sport |
| 8 | Yuki Niizawa (C) | 50D | 1L | 1.59 m (5 ft 3 in) | 56 kg (123 lb) | (1997-02-13)13 February 1997 (aged 24) | 51 | 0/0 | Nittai Club |
| 9 | Minori Yamamoto | 50D | 2R | 1.56 m (5 ft 1 in) | 80 kg (176 lb) | (1997-10-14)14 October 1997 (aged 23) | 45 | 0/0 | Shumei University |
| 10 | Kako Kawaguchi | 50D | 1L | 1.59 m (5 ft 3 in) | 56 kg (123 lb) | (1999-07-14)14 July 1999 (aged 22) | 6 | 0/0 | Nippon Sport |
| 11 | Marina Tokumoto | 20CB | 2R | 1.64 m (5 ft 5 in) | 60 kg (132 lb) | (1996-02-02)2 February 1996 (aged 25) | 65 | 0/0 | Toeikai |
| 12 | Kyoko Kudo | 50D | 2R | 1.65 m (5 ft 5 in) | 56 kg (123 lb) | (2001-02-10)10 February 2001 (aged 20) | 6 | 0/0 | Nippon Sport |
| 13 | Minami Shioya | 10GK | 2R | 1.73 m (5 ft 8 in) | 68 kg (150 lb) | (1997-07-27)27 July 1997 (aged 23) | 51 | 0/0 | Shumei University |
| Average | Average | Average | Average | 1.66 m (5 ft 5 in) | 64 kg (141 lb) | 23 years, 302 days | 36 | | |
Note: Age as of 23 July 2021 Source: Japan Women | Tokyo 2020 Olympics Archived 2021-07-22 at the Wayback Machine
Group play
| Pos | Teamvte | Pld | W | D | L | GF | GA | GD | Pts | Qualification |
| 1 | United States | 4 | 3 | 0 | 1 | 64 | 26 | +38 | 6 | Quarterfinals |
| 2 | Hungary | 4 | 2 | 1 | 1 | 46 | 43 | +3 | 5 | Quarterfinals |
| 3 | ROC | 4 | 2 | 1 | 1 | 53 | 61 | −8 | 5 | Quarterfinals |
| 4 | China | 4 | 2 | 0 | 2 | 51 | 50 | +1 | 4 | Quarterfinals |
| 5 | Japan (H) | 4 | 0 | 0 | 4 | 44 | 78 | −34 | 0 | |
* 1 2 ROC10–10 Hungary
| 24 July 2021 (2021-07-24) 14:00 v | Report | Japan | 4–25 | United States | Tokyo Tatsumi International Swimming Center Referees: Germán Moller (ARG), Nicola Johnson (AUS) |
| Tokyo Tatsumi International Swimming Center Referees: Germán Moller (ARG), Nicola Johnson (AUS) |||
| 24 July 2021 (2021-07-24) 14:00 v | Report | Koide 2 | Goals | Haralabidis, Steffens 5 | Tokyo Tatsumi International Swimming Center Referees: Germán Moller (ARG), Nicola Johnson (AUS) |
| 28 July 2021 (2021-07-28) 18:20 v | Report | China | 16–11 | Japan | Tokyo Tatsumi International Swimming Center Referees: Marie-Claude Deslières (CAN), Viktor Salnichenko (KAZ) |
| Tokyo Tatsumi International Swimming Center Referees: Marie-Claude Deslières (CAN), Viktor Salnichenko (KAZ) |||
| 28 July 2021 (2021-07-28) 18:20 v | Report | Zhang 5 | Goals | Arima 3 | Tokyo Tatsumi International Swimming Center Referees: Marie-Claude Deslières (CAN), Viktor Salnichenko (KAZ) |
| 30 July 2021 (2021-07-30) 18:20 v | Report | Japan | 13–17 | Hungary | Tokyo Tatsumi International Swimming Center Referees: Adrian Alexandrescu (ROU), Vojin Putniković (SRB) |
| Tokyo Tatsumi International Swimming Center Referees: Adrian Alexandrescu (ROU), Vojin Putniković (SRB) |||
| 30 July 2021 (2021-07-30) 18:20 v | Report | Arima, Inaba 4 | Goals | Parkes 6 | Tokyo Tatsumi International Swimming Center Referees: Adrian Alexandrescu (ROU), Vojin Putniković (SRB) |
| 1 August 2021 (2021-08-01) 18:20 v | Report | ROC | 20–16 | Japan | Tokyo Tatsumi International Swimming Center Referees: Marie-Claude Deslières (CAN), Dion Willis (RSA) |
| Tokyo Tatsumi International Swimming Center Referees: Marie-Claude Deslières (CAN), Dion Willis (RSA) |||
| 1 August 2021 (2021-08-01) 18:20 v | Report | Serzhantova 4 | Goals | Arima 5 | Tokyo Tatsumi International Swimming Center Referees: Marie-Claude Deslières (CAN), Dion Willis (RSA) |

## Weightlifting

Japanese weightlifters qualified for four quota places at the games, based on the Tokyo 2020 Rankings Qualification List of 11 June 2021 and three quotas from Host Nation Quotas.

### Men

| Athlete | Event | Snatch | Snatch | Clean & jerk | Clean & jerk | Total | Rank |
| Athlete | Event | Result | Rank | Result | Rank | Total | Rank |
| Yoichi Itokazu | −61 kg | 133 | 3 | 159 | 5 | 292 | 4 |
| Mitsunori Konnai | −67 kg | 135 | 11 | 172 | 6 | 307 | 7 |
| Masanori Miyamoto | −73 kg | 147 | 8 | 188 | 5 | 335 | 7 |
| Toshiki Yamamoto | −96 kg | 168 | 7 | 200 | DNF | 168 | DNF |

### Women

| Athlete | Event | Snatch | Snatch | Clean & jerk | Clean & jerk | Total | Rank |
| Athlete | Event | Result | Rank | Result | Rank | Total | Rank |
| Hiromi Miyake | −49 kg | 74 | 11 | 99 | DNF | 74 | DNF |
| Kanae Yagi | −55 kg | 81 | 13 | 102 | 10 | 183 | 11 |
| Mikiko Andoh | −59 kg | 94 | 6 | 120 | 3 | 214 | |

## Wrestling

Japan qualified twelve wrestlers for each of the following classes into the Olympic competition. Eight of them finished among the top six to book Olympic spots in the men's freestyle (65 and 74 kg), men's Greco-Roman 60 kg and women's freestyle wrestling (53, 57, 62, 68, and 76 kg) at the 2019 World Championships, while two additional licenses were awarded to the Japanese wrestlers, who progressed to the top two finals of the men's Greco-Roman 77 kg and women's freestyle 50 kg, respectively, at the 2021 Asian Qualification Tournament in Almaty, Kazakhstan. Two Japanese wrestlers claimed one of the remaining slots each in the men's freestyle 57 and 86 kg, respectively, to complete the host nation's roster at the 2021 World Qualification Tournament in Sofia, Bulgaria.
Key:
* VT (ranking points: 5–0 or 0–5) – Victory by fall.
* VB (ranking points: 5–0 or 0–5) – Victory by injury (VF for forfeit, VA for withdrawal or disqualification)
* PP (ranking points: 3–1 or 1–3) – Decision by points – the loser with technical points.
* PO (ranking points: 3–0 or 0–3) – Decision by points – the loser without technical points.
* ST (ranking points: 4–0 or 0–4) – Great superiority – the loser without technical points and a margin of victory of at least 8 (Greco-Roman) or 10 (freestyle) points.
* SP (ranking points: 4–1 or 1–4) – Technical superiority – the loser with technical points and a margin of victory of at least 8 (Greco-Roman) or 10 (freestyle) points.
Freestyle
| Athlete | Event | Round of 16 | Quarterfinals | Semifinals | Repechage | Final / BM | Final / BM |
| Athlete | Event | Opposition Result | Opposition Result | Opposition Result | Opposition Result | Opposition Result | Rank |
| Yuki Takahashi | Men's −57 kg | Mićić (SRB) W 3–0 $^{PO}$ | Sanayev (KAZ) L 1–3 $^{PP}$ | Did not advance | Did not advance | Did not advance | 8 |
| Takuto Otoguro | Men's −65 kg | Tömör-Ochir (MGL) W 3–1 $^{PP}$ | Muszukajev (HUN) W 3–1 $^{PP}$ | Rashidov (ROC) W 3–1 $^{PP}$ | Bye | Aliyev (AZE) W 3–1 $^{PP}$ | |
| Keisuke Otoguro | Men's −74 kg | Kaisanov (KAZ) L 0–5 $^{VT}$ | Did not advance | Did not advance | Did not advance | Did not advance | 14 |
| Sosuke Takatani | Men's −86 kg | Göçen (TUR) L 1–3 $^{PP}$ | Did not advance | Did not advance | Did not advance | Did not advance | 9 |
| Yui Susaki | Women's −50 kg | Tsogt-Ochir (MGL) W 4–0 $^{ST}$ | Yépez (ECU) W 4–0 $^{ST}$ | Stadnik (AZE) W 4–0 $^{ST}$ | Bye | Sun Yn (CHN) W 4–0 $^{ST}$ | |
| Mayu Mukaida | Women's −53 kg | Essombe (CMR) W 4–0 $^{ST}$ | Zasina (POL) W 4–1 $^{SP}$ | Bat-Ochir (MGL) W 3–1 $^{PP}$ | Bye | Pang Qy (CHN) W 3–1 $^{PP}$ | |
| Risako Kawai | Women's −57 kg | Camara (GUI) W 3–1 $^{PP}$ | Boldsaikhan (MGL) W 3–0 $^{PO}$ | Maroulis (USA) W 3–1 $^{PP}$ | Bye | Kurachkina (BLR) W 3–0 $^{PO}$ | |
| Yukako Kawai | Women's −62 kg | Ovcharova (ROC) W 4–0 $^{ST}$ | Johansson (SWE) W 3–1 $^{PP}$ | Yusein (BUL) W 3–1 $^{PP}$ | Bye | Tynybekova (KGZ) W 3–1 $^{PP}$ | |
| Sara Dosho | Women's −68 kg | Mensah (USA) L 0–4 $^{ST}$ | Did not advance | Did not advance | Zhou F (CHN) W 3–1 $^{PP}$ | Cherkasova (UKR) L 0–5 $^{VT}$ | 5 |
| Hiroe Minagawa | Women's −76 kg | Ochirbat (MGL) W 3–0 $^{PO}$ | Mäe (EST) W 3–0 $^{PO}$ | Rotter-Focken (GER) L 1–3 $^{PP}$ | Bye | Zhou Q (CHN) L 0–5 $^{VT}$ | 5 |
Greco-Roman
| Athlete | Event | Round of 16 | Quarterfinals | Semifinals | Repechage | Final / BM | Final / BM |
| Athlete | Event | Opposition Result | Opposition Result | Opposition Result | Opposition Result | Opposition Result | Rank |
| Kenichiro Fumita | Men's −60 kg | Fergat (ALG) W 4–0 $^{ST}$ | Walihan (CHN) W 3–1 $^{PP}$ | Temirov (UKR) W 3–1 $^{PP}$ | Bye | Orta (CUB) L 1–3 $^{PP}$ | |
| Shohei Yabiku | Men's −77 kg | Zhadrayev (KAZ) W 3–1 $^{PP}$ | Lőrincz (HUN) L 1–3 $^{PP}$ | Did not advance | Ayet Ikram (MAR) W 5–0 $^{VB}$ | Ali Geraei (IRI) W 4–1 $^{SP}$ | |