# Swimming at the 2023 World Aquatics Championships – Men's 100 metre butterfly

The men's 100 metre butterfly competition at the 2023 World Aquatics Championships was held on 28 and 29 July 2023.

## Records

Prior to the competition, the existing world and championship records were as follows.
| World record | Caeleb Dressel (USA) | 49.45 | Tokyo, Japan | 31 July 2021 |
| Competition record | Caeleb Dressel (USA) | 49.50 | Gwangju, South Korea | 26 July 2019 |

## Results
### Heats

The heats were started on 28 July at 10:32.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 7 | 3 | Matthew Temple | Australia | 50.76 | Q |
| 2 | 7 | 2 | Nyls Korstanje | Netherlands | 50.78 | Q, NR |
| 3 | 8 | 4 | Joshua Liendo | Canada | 50.98 | Q |
| 4 | 7 | 4 | Maxime Grousset | France | 51.00 | Q |
| 4 | 7 | 5 | Noè Ponti | Switzerland | 51.00 | Q |
| 6 | 6 | 4 | Dare Rose | United States | 51.17 | Q |
| 7 | 7 | 7 | Ilya Kharun | Canada | 51.33 | Q |
| 8 | 5 | 5 | Josif Miladinov | Bulgaria | 51.47 | Q |
| 8 | 7 | 0 | Kayky Mota | Brazil | 51.47 | Q |
| 10 | 6 | 5 | Katsuhiro Matsumoto | Japan | 51.48 | Q |
| 11 | 8 | 2 | James Guy | Great Britain | 51.50 | Q |
| 12 | 8 | 7 | Diogo Ribeiro | Portugal | 51.57 | Q |
| 13 | 8 | 0 | Gal Cohen Groumi | Israel | 51.61 | Q |
| 14 | 6 | 9 | Adilbek Mussin | Kazakhstan | 51.68 | Q, NR |
| 15 | 8 | 3 | Tomer Frankel | Israel | 51.76 | Q |
| 16 | 6 | 3 | Jacob Peters | Great Britain | 51.77 | S/off |
| 16 | 7 | 6 | Thomas Heilman | United States | 51.77 | S/off |
| 18 | 6 | 2 | Wang Changhao | China | 51.78 | |
| 19 | 8 | 5 | Naoki Mizunuma | Japan | 51.93 | |
| 20 | 6 | 7 | Federico Burdisso | Italy | 51.98 | |
| 21 | 7 | 1 | Piero Codia | Italy | 52.01 | |
| 22 | 7 | 9 | Mario Molla Yanes | Spain | 52.05 | |
| 23 | 6 | 1 | Adrian Jaskiewicz | Poland | 52.10 | |
| 24 | 8 | 1 | Shaun Champion | Australia | 52.15 | |
| 25 | 6 | 8 | Sun Jiajun | China | 52.16 | |
| 26 | 8 | 6 | Simon Bucher | Austria | 52.27 | |
| 27 | 6 | 0 | Youssef Ramadan | Egypt | 52.31 | |
| 27 | 8 | 8 | Richárd Márton | Hungary | 52.31 | |
| 29 | 5 | 0 | Jorge Iga | Mexico | 52.39 | |
| 30 | 8 | 9 | Quah Zheng Wen | Singapore | 52.53 | |
| 31 | 5 | 1 | Kim Young-beom | South Korea | 52.80 | |
| 32 | 4 | 4 | Jarod Hatch | Suspended Member Federation | 52.87 | NR |
| 33 | 5 | 2 | Lewis Clareburt | New Zealand | 52.89 | |
| 34 | 5 | 4 | Daniel Zaitsev | Estonia | 52.92 | |
| 35 | 4 | 3 | Bryan Leong | Malaysia | 52.96 | NR |
| 36 | 7 | 8 | Jan Eric Friese | Germany | 53.02 | |
| 37 | 5 | 6 | Daniel Gracik | Czech Republic | 53.13 | |
| 38 | 5 | 8 | Andreas Vazaios | Greece | 53.38 | |
| 39 | 5 | 3 | Jorge Otaiza | Venezuela | 53.44 | |
| 40 | 5 | 7 | Max McCusker | Ireland | 53.46 | |
| 41 | 4 | 6 | Denys Kesil | Ukraine | 53.47 | |
| 42 | 4 | 8 | Abeku Jackson | Ghana | 53.73 | |
| 43 | 4 | 5 | Navaphat Wongcharoen | Thailand | 53.84 | |
| 44 | 4 | 1 | Diego Balbi | Peru | 53.92 | |
| 45 | 4 | 7 | Oskar Hoff | Sweden | 53.97 | |
| 46 | 4 | 9 | Steven Aimable | Senegal | 53.98 | |
| 47 | 3 | 8 | Tibor Tistan | Slovakia | 54.30 | |
| 48 | 1 | 5 | Isaiah Aleksenko | Northern Mariana Islands | 54.46 | NR |
| 49 | 4 | 0 | Benjamin Hockin | Paraguay | 54.69 | |
| 50 | 3 | 2 | Esteban Nuñez del Prado | Bolivia | 55.26 | |
| 51 | 3 | 4 | Salvador Gordo | Angola | 55.44 | |
| 52 | 3 | 1 | Davante Carey | Bahamas | 55.48 | |
| 53 | 4 | 2 | Joe Aditya Wijaya Kurniawan | Indonesia | 55.55 | |
| 54 | 3 | 5 | Tomas Lomero Arenas | Andorra | 55.60 | |
| 55 | 3 | 7 | Jeancarlo Calderon Harper | Panama | 55.63 | |
| 56 | 2 | 6 | Christian Jerome | Haiti | 55.83 | |
| 57 | 3 | 3 | Jayhan Odlum-Smith | Saint Lucia | 55.86 | |
| 58 | 3 | 6 | Yousuf Al-Matrooshi | United Arab Emirates | 56.05 | |
| 59 | 1 | 6 | Tameea Elhamayda | Qatar | 56.11 | |
| 60 | 3 | 0 | Zackary Gresham | Grenada | 56.91 | |
| 61 | 3 | 9 | Clinton Opute | Nigeria | 57.19 | |
| 62 | 2 | 9 | James Hendrix | Guam | 57.65 | |
| 63 | 1 | 2 | Osama Trabulsi | Syria | 58.90 | |
| 64 | 2 | 4 | Mohamad Masoud | Athlete Refugee Team | 58.91 | |
| 65 | 2 | 2 | Ali Haidar | Kuwait | 59.94 | |
| 66 | 2 | 3 | Abdulhai Ashour | Libya | 59.98 | |
| 67 | 2 | 5 | Kokoro Frost | Samoa | 1:00.20 | |
| 68 | 1 | 4 | Abdul Al-Kulaibi | Oman | 1:01.18 | NR |
| 69 | 2 | 1 | Kinley Lhendup | Bhutan | 1:02.84 | |
| 70 | 1 | 7 | Nathaniel Noka | Papua New Guinea | 1:03.69 | |
| 71 | 2 | 7 | Simanga Dlamini | Eswatini | 1:04.50 | |
| 72 | 1 | 3 | Nicky Irakoze | Burundi | 1:05.28 | |
| 73 | 2 | 8 | Elhadj Diallo | Guinea | 1:05.39 | |
| 74 | 2 | 0 | Troy Pina | Cape Verde | 1:05.63 | |
| | 5 | 9 | Jaouad Syoud | Algeria | DNS | DNS |
| | 6 | 6 | Hubert Kós | Hungary | DNS | DNS |

#### Swim-off

The swim-off was started on 28 July at 12:55.
| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | Jacob Peters | Great Britain | 51.39 | Q |
| 2 | 5 | Thomas Heilman | United States | 51.66 | |

### Semifinals

The semifinals were held on 28 July at 20:09.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 1 | 3 | Dare Rose | United States | 50.53 | Q |
| 2 | 1 | 5 | Maxime Grousset | France | 50.62 | Q |
| 3 | 2 | 5 | Joshua Liendo | Canada | 50.75 | Q |
| 4 | 2 | 4 | Matthew Temple | Australia | 50.89 | Q |
| 5 | 1 | 4 | Nyls Korstanje | Netherlands | 50.98 | Q |
| 5 | 2 | 1 | Gal Cohen Groumi | Israel | 50.98 | Q , NR |
| 7 | 1 | 2 | Katsuhiro Matsumoto | Japan | 51.16 | Q |
| 8 | 2 | 3 | Noè Ponti | Switzerland | 51.17 | Q |
| 9 | 2 | 6 | Ilya Kharun | Canada | 51.22 | |
| 10 | 2 | 2 | Kayky Mota | Brazil | 51.43 | |
| 10 | 2 | 7 | James Guy | Great Britain | 51.43 | |
| 12 | 1 | 8 | Jacob Peters | Great Britain | 51.51 | |
| 13 | 1 | 7 | Diogo Ribeiro | Portugal | 51.54 | |
| 14 | 1 | 1 | Adilbek Mussin | Kazakhstan | 51.81 | |
| 14 | 1 | 6 | Josif Miladinov | Bulgaria | 51.81 | |
| 16 | 2 | 8 | Tomer Frankel | Israel | 52.04 | |

### Final

The final was started on 29 July at 20:42.
| Rank | Lane | Name | Nationality | Time | Notes |
| | 5 | Maxime Grousset | France | 50.14 | NR |
| | 3 | Joshua Liendo | Canada | 50.34 | NR |
| | 4 | Dare Rose | United States | 50.46 | |
| 4 | 6 | Matthew Temple | Australia | 50.81 | |
| 5 | 2 | Nyls Korstanje | Netherlands | 51.05 | |
| 6 | 1 | Katsuhiro Matsumoto | Japan | 51.20 | |
| 7 | 8 | Noè Ponti | Switzerland | 51.23 | |
| 8 | 7 | Gal Cohen Groumi | Israel | 51.32 | |