# List of Japanese boxing world champions

This is a list of Japanese boxing world champions who have won major world titles from the "Big four" governing bodies in professional boxing namely the World Boxing Association (WBA), World Boxing Council (WBC), International Boxing Federation (IBF) and World Boxing Organization (WBO). It was in 1952 that Yoshio Shirai won the world flyweight crown, becoming the first Japanese world champion. Japan ranks fourth worldwide between countries with the most boxing world champions.
The most thriving period of Japan's boxing ran from the 1960s to the early 1970s. In the "golden 60s," Fighting Harada won championships in two divisions—flyweight and bantamweight. In the 1970s, Japan had 5 world champions for a short period at the same time. Notable achievements in that period were Kuniaki Shibata's attainment of 3 world championships in two divisions, Guts Ishimatsu captured the WBC lightweight championship becoming the first Japanese champion in the lightweight division. Koichi Wajima, one of the most popular boxers in Japan for his peculiar "Frog Jump" uppercut punch, also left a big footstep in Japan's boxing history by winning junior middleweight championship 3 times including 6 consecutive title defenses.

## List of men's professional boxing world champions

The following is a list of Japanese boxing champions who have held titles from one or more of the "Big Four" organizations (WBA, WBC, IBF, WBO) and The Ring.
WBA has four recognized world champions, Super, Undisputed, Unified, and Regular. The highest tier title is considered the primary champion of the division. Only boxers who are in the primary champion lineage are listed.
The ranking of WBA's primary champions are as follows:
* Super/Undisputed
* Unified
* Regular
Other former international/national-world boxing commissions and organizations from the beginning of boxing are also included here:
* New York State Athletic Commission (NYSAC)
* National Boxing Association (NBA) - changed its name to World Boxing Association (WBA) in 1962
| | Inducted into the International Boxing Hall of Fame |
| | World titles from world and The Ring |
| | WBA Regular champion |
| ‡ | denotes that the WBA Super, Undisputed, and Unified is vacant/vacated during his title reign. The Regular title becomes the primary tile. |
| No. | Name | Titles | Date | Opponent | Result |
| 1 | Yoshio Shirai | NYSAC Flyweight (112) | May 19, 1952 | Dado Marino | UD 15/15 |
| 1 | Yoshio Shirai | NBA Flyweight (112) | May 19, 1952 | Dado Marino | UD 15/15 |
| 1 | Yoshio Shirai | The Ring Flyweight (112) | May 19, 1952 | Dado Marino | UD 15/15 |
| 2 | Fighting Harada | NYSAC Flyweight (112) | Oct 10, 1962 | Pone Kingpetch | KO 11/15 |
| 2 | Fighting Harada | WBA Flyweight (112) | Oct 10, 1962 | Pone Kingpetch | KO 11/15 |
| 2 | Fighting Harada | The Ring Flyweight (112) | Oct 10, 1962 | Pone Kingpetch | KO 11/15 |
| 2 | Fighting Harada | WBA Bantamweight (118) | May 18, 1965 | Éder Jofre | SD 15/15 |
| 2 | Fighting Harada | WBC Bantamweight (118) | May 18, 1965 | Éder Jofre | SD 15/15 |
| 2 | Fighting Harada | The Ring Bantamweight (118) | May 18, 1965 | Éder Jofre | SD 15/15 |
| 3 | Hiroyuki Ebihara | WBA Flyweight (112) | Sep 18, 1963 | Pone Kingpetch | KO 1/15 |
| 3 | Hiroyuki Ebihara | WBC Flyweight (112) | Sep 18, 1963 | Pone Kingpetch | KO 1/15 |
| 3 | Hiroyuki Ebihara | The Ring Flyweight (112) | Sep 18, 1963 | Pone Kingpetch | KO 1/15 |
| 3 | Hiroyuki Ebihara | WBA Flyweight (112) – (2) | Mar 30, 1969 | Jose Severino | UD 15/15 |
| 4 | Takeshi Fuji | WBA Light welterweight (140) | Apr 30, 1967 | Sandro Lopopolo | KO 2/15 |
| 4 | Takeshi Fuji | WBC Light welterweight (140) | Apr 30, 1967 | Sandro Lopopolo | KO 2/15 |
| 4 | Takeshi Fuji | The Ring Light welterweight (140) | Apr 30, 1967 | Sandro Lopopolo | KO 2/15 |
| 5 | Yoshiaki Numata | WBA Super featherweight (130) | Jun 15, 1967 | Flash Elorde | MD 15/15 |
| 5 | Yoshiaki Numata | WBC Super featherweight (130) | Jun 15, 1967 | Flash Elorde | MD 15/15 |
| 5 | Yoshiaki Numata | The Ring Super featherweight (130) | Jun 15, 1967 | Flash Elorde | MD 15/15 |
| 5 | Yoshiaki Numata | WBC Super featherweight (130) – (2) | Apr 5, 1970 | Rene Barrientos | SD 15/15 |
| 6 | Hiroshi Kobayashi | WBA Super featherweight (130) | Dec 14, 1967 | Yoshiaki Numata | MD 15/15 |
| 6 | Hiroshi Kobayashi | WBC Super featherweight (130) | Dec 14, 1967 | Yoshiaki Numata | MD 15/15 |
| 6 | Hiroshi Kobayashi | The Ring Super featherweight (130) | Dec 14, 1967 | Yoshiaki Numata | MD 15/15 |
| 7 | Shozo Saijo | WBA Featherweight (126) | Sep 27, 1968 | Raul Rojas | UD 15/15 |
| 8 | Masao Ohba | WBA Flyweight (112) | Oct 22, 1970 | Berkrerk Chartvanchai | TKO 13/15 |
| 9 | Kuniaki Shibata | WBC Featherweight (126) | Dec 11, 1970 | Vincente Saldivar | RTD 12/15 |
| 9 | Kuniaki Shibata | The Ring Featherweight (126) | Dec 11, 1970 | Vincente Saldivar | RTD 12/15 |
| 9 | Kuniaki Shibata | WBA Super featherweight (130) | Mar 12, 1973 | Ben Villaflor | UD 15/15 |
| 9 | Kuniaki Shibata | The Ring Super featherweight (130) | Mar 12, 1973 | Ben Villaflor | UD 15/15 |
| 9 | Kuniaki Shibata | WBC Super featherweight (130) | Feb 28, 1974 | Ricardo Arredondo | UD 15/15 |
| 10 | Koichi Wajima | WBA Light middleweight (154) | Oct 31, 1971 | Carmelo Bossi | SD 15/15 |
| 10 | Koichi Wajima | WBC Light middleweight (154) | Oct 31, 1971 | Carmelo Bossi | SD 15/15 |
| 10 | Koichi Wajima | The Ring Light middleweight (154) | Oct 31, 1971 | Carmelo Bossi | SD 15/15 |
| 10 | Koichi Wajima | WBA Light middleweight (154) – (2) | Jan 21, 1975 | Oscar Albarado | UD 15/15 |
| 10 | Koichi Wajima | WBC Light middleweight (154) – (2) | Jan 21, 1975 | Oscar Albarado | UD 15/15 |
| 10 | Koichi Wajima | The Ring Light middleweight (154) – (2) | Jan 21, 1975 | Oscar Albarado | UD 15/15 |
| 10 | Koichi Wajima | WBA Light middleweight (154) – (3) | Jan 17, 1976 | Yuh Jae-Doo | KO 15/15 |
| 11 | Guts Ishimatsu | WBC Lightweight (135) | Apr 11, 1974 | Rodolfo Gato González | TKO 8/15 |
| 12 | Shoji Oguma | WBC Flyweight (112) | Oct 1, 1974 | Betulio González | SD 15/15 |
| 12 | Shoji Oguma | WBC Flyweight (112) – (2) | May 18, 1980 | Park Chan-Hee | KO 9/15 |
| 12 | Shoji Oguma | The Ring Flyweight (112) | May 18, 1980 | Park Chan-Hee | KO 9/15 |
| 13 | Susumu Hanagata | WBA Flyweight (112) | Oct 18, 1974 | Chartchai Chionoi | TKO 6/15 |
| 14 | Royal Kobayashi | WBC Super bantamweight (122) | Oct 9, 1976 | Rigoberto Riasco | TKO 8/15 |
| 15 | Yoko Gushiken | WBA Light flyweight (108) | Oct 10, 1976 | Juan Antonio Guzmán | KO 7/15 |
| 16 | Masashi Kudo | WBA Light middleweight (154) | Aug 9, 1978 | Eddie Gazo | SD 15/15 |
| 16 | Masashi Kudo | The Ring Light middleweight (154) | Aug 9, 1978 | Eddie Gazo | SD 15/15 |
| 17 | Shigeo Nakajima | WBC Light flyweight (108) | Jan 3, 1980 | Kim Sung-Jun | UD 15/15 |
| 18 | Yasutsune Uehara | WBA Super featherweight (130) | Aug 2, 1980 | Samuel Serrano | KO 6/15 |
| 18 | Yasutsune Uehara | The Ring Super featherweight (130) | Aug 2, 1980 | Samuel Serrano | KO 6/15 |
| 19 | Tadashi Mihara | WBA Light middleweight (154) | Nov 7, 1981 | Rocky Frato | MD 15/15 |
| 20 | Katsuo Tokashiki | WBA Light flyweight (108) | Dec 16, 1981 | Kim Hwan Jin | UD 15/15 |
| 21 | Jiro Watanabe | WBA Super flyweight (115) | Apr 8, 1982 | Rafael Pedroza | UD 15/15 |
| 21 | Jiro Watanabe | WBC Super flyweight (115) | Nov 29, 1984 | Payao Poontarat | UD 12/12 |
| 22 | Tadashi Tomori | WBC Light flyweight (108) | Apr 13, 1982 | Amado Ursúa | UD 12/12 |
| 23 | Kōji Kobayashi | WBC Flyweight (112) | Jan 18, 1984 | Frank Cedeno | TKO 2/12 |
| 23 | Kōji Kobayashi | The Ring Flyweight (112) | Jan 18, 1984 | Frank Cedeno | TKO 2/12 |
| 24 | Satoshi Shingaki | IBF Bantamweight (118) | Apr 15, 1984 | Elmer Magallano | TKO 8/12 |
| 25 | Tsuyoshi Hamada | WBC Light welterweight (140) | Jul 24, 1986 | René Arredondo | KO 1/12 |
| 26 | Takuya Muguruma | WBA Bantamweight (118) | Mar 29, 1987 | Azael Moran | KO 5/12 |
| 27 | Hiroki Ioka | WBC Mini flyweight (105) | Oct 18, 1987 | Mai Thomburifarm | UD 12/12 |
| 27 | Hiroki Ioka | WBA Light flyweight (108) | Dec 17, 1991 | Yuh Myung-Woo | SD 12/12 |
| 28 | Hideyuki Ohashi | WBC Mini flyweight (105) | Feb 7, 1990 | Choi Jum-Hwan | TKO 5/12 |
| 28 | Hideyuki Ohashi | WBA Mini flyweight (105) | Oct 14, 1992 | Choi Hi-Yong | UD 12/12 |
| 29 | Leopard Tamakuma | WBA Flyweight (112) | Jul 29, 1990 | Lee Yul-Woo | TKO 10/12 |
| 30 | Kiyoshi Hatanaka | WBC Super bantamweight (122) | Feb 3, 1991 | Pedro Rubén Décima | TKO 8/12 |
| 31 | Joichiro Tatsuyoshi | WBC Bantamweight (118) | Sep 19, 1991 | Greg Richardson | RTD 10/12 |
| 31 | Joichiro Tatsuyoshi | WBC Bantamweight (118) – (2) | Nov 22, 1997 | Sirimongkol Singwancha | TKO 7/12 |
| 32 | Katsuya Onizuka | WBA Super flyweight (115) | Apr 10, 1992 | Thanomsak Sithbaobay | UD 12/12 |
| 33 | Akinobu Hiranaka | WBA Light welterweight (140) | Apr 10, 1992 | Edwin Rosario | TKO 1/12 |
| 34 | Yasuei Yakushiji | WBC Bantamweight (118) | Dec 23, 1993 | Byun Jung-Il | SD 12/12 |
| 35 | Hiroshi Kawashima | WBC Super flyweight (115) | May 4, 1994 | Jose Luis Bueno | UD 12/12 |
| 36 | Shinji Takehara | WBA Middleweight (160) | Dec 19, 1995 | Jorge Castro | UD 12/12 |
| 37 | Keiji Yamaguchi | WBA Light flyweight (108) | May 21, 1996 | Carlos Murillo | SD 12/12 |
| 38 | Satoshi Iida | WBA Super flyweight (115) | Dec 23, 1997 | Yokthai Sithoar | UD 12/12 |
| 39 | Takanori Hatakeyama | WBA Super featherweight (130) | Sep 5, 1998 | Choi Yong-Soo | UD 12/12 |
| 39 | Takanori Hatakeyama | WBA Lightweight (135) | Jun 11, 2000 | Gilberto Serrano | TKO 8/12 |
| 40 | Hideki Todaka | WBA Super flyweight (115) | Mar 18, 1999 | Jesus Kiki Rojas | UD 12/12 |
| 41 | Keitaro Hoshino | WBA Mini flyweight (105) | Dec 6, 2000 | Joma Gamboa | UD 12/12 |
| 41 | Keitaro Hoshino | WBA Mini flyweight (105) – (2) | Jan 29, 2002 | Joma Gamboa | UD 12/12 |
| 42 | Celes Kobayashi | WBA Super flyweight (115) | Mar 11, 2001 | Leo Gámez | TKO 10/12 |
| 43 | Yutaka Niida | WBA Mini flyweight (105) | Aug 25, 2001 | Chana Porpaoin | UD 12/12 |
| 43 | Yutaka Niida | WBA Mini flyweight (105) – (2) | Jul 3, 2004 | Noel Arambulet | UD 12/12 |
| 44 | Osamu Sato | WBA Super bantamweight (122) | May 18, 2002 | Yoddamrong Sithyodthong | KO 8/12 |
| 45 | Katsushige Kawashima | WBC Super flyweight (115) | Jun 28, 2004 | Masamori Tokuyama | KO 1/12 |
| 45 | Katsunari Takayama | WBC Mini flyweight (105) | Apr 4, 2005 | Isaac Bustos | UD 12/12 |
| 45 | Katsunari Takayama | IBF Mini flyweight (105) | Mar 30, 2013 | Mario Rodríguez | UD 12/12 |
| 45 | Katsunari Takayama | IBF Mini flyweight (105) – (2) | Dec 31, 2014 | Go Odaira | TKO 7/12 |
| 45 | Katsunari Takayama | WBO Mini flyweight (105) | Dec 31, 2014 | Go Odaira | TKO 7/12 |
| 45 | Katsunari Takayama | WBO Mini flyweight (105) – (2) | Aug 20, 2016 | Riku Kano | TD 6/12 |
| 46 | Hozumi Hasegawa | WBC Bantamweight (118) | Apr 16, 2005 | Veeraphol Sahaprom | UD 12/12 |
| 46 | Hozumi Hasegawa | WBC Featherweight (126) | Nov 26, 2010 | Juan Carlos Burgos | UD 12/12 |
| 46 | Hozumi Hasegawa | WBC Super bantamweight (122) | Sep 16, 2016 | Hugo Ruiz | RTD 9/12 |
| 47 | Takashi Koshimoto | WBC Featherweight (126) | Jan 29, 2006 | Chi In-Jin | UD 12/12 |
| 48 | Nobuo Nashiro | WBA Super flyweight (115) | Jul 22, 2006 | Martín Castillo | TKO 10/12 |
| 49 | Koki Kameda | WBA Light flyweight (108) | Aug 2, 2006 | Juan Jose Landaeta | SD 12/12 |
| 49 | Koki Kameda | WBC Flyweight (112) | Nov 29, 2009 | Daisuke Naito | UD 12/12 |
| 50 | Takefumi Sakata | WBA Flyweight (112) | Mar 19, 2007 | Lorenzo Parra | TKO 3/12 |
| 51 | Daisuke Naito | WBC Flyweight (112) | Jul 18, 2007 | Pongsaklek Wonjongkam | UD 12/12 |
| 52 | Toshiaki Nishioka | WBC Super bantamweight (122) | Jan 3, 2009 | Genaro García | TKO 12/12 |
| 53 | Takahiro Ao | WBC Featherweight (126) | Mar 12, 2009 | Óscar Larios | UD 12/12 |
| 53 | Takahiro Ao | WBC Super featherweight (130) | Nov 26, 2010 | Vitali Tajbert | UD 12/12 |
| 54 | Takashi Uchiyama | WBA (Regular$^‡$) Super featherweight (130) later promoted to Super. | Regular$^‡$ Jan 11, 2010 | Juan Carlos Salgado | TKO 12/12 |
| 54 | Takashi Uchiyama | WBA (Regular$^‡$) Super featherweight (130) later promoted to Super. | Super Feb 15, 2015 | Promoted | Promoted |
| 55 | Daiki Kameda | WBA Flyweight (112) | Feb 7, 2010 | Denkaosan Kaovichit | UD 12/12 |
| 55 | Daiki Kameda | IBF Super flyweight (115) | Sep 3, 2013 | Rodrigo Guerrero | UD 12/12 |
| 56 | Akifumi Shimoda | WBA (Regular$^‡$) Super bantamweight (122) | Jan 31, 2011 | Ryol Li Lee | UD 12/12 |
| 57 | Kazuto Ioka | WBC Mini flyweight (105) | Feb 11, 2011 | Oleydong Sithsamerchai | TKO 5/12 |
| 57 | Kazuto Ioka | WBA Mini flyweight (105) | Jun 20, 2012 | Akira Yaegashi | UD 12/12 |
| 57 | Kazuto Ioka | WBA (Regular$^‡$) Light flyweight (108) | Jan 14, 2014 | Primary champion vacant | Primary champion vacant |
| 57 | Kazuto Ioka | WBA (Regular$^‡$) Flyweight (112) | Sep 14, 2016 | Primary champion vacant | Primary champion vacant |
| 57 | Kazuto Ioka | WBO Super flyweight (115) | Jun 19, 2019 | Aston Palicte | TKO 10/12 |
| 57 | Kazuto Ioka | WBA Super flyweight (115) | Jun 24, 2023 | Joshua Franco | UD 12/12 |
| 58 | Tomonobu Shimizu | WBA (Regular$^‡$) Super flyweight (115) | Aug 31, 2011 | Hugo Cázares | SD 12/12 |
| 59 | Akira Yaegashi | WBA Mini flyweight (105) | Oct 24, 2011 | Pornsawan Porpramook | TKO 10/12 |
| 59 | Akira Yaegashi | WBC Flyweight (112) | Apr 8, 2013 | Toshiyuki Igarashi | UD 12/12 |
| 59 | Akira Yaegashi | The Ring Flyweight (112) | Apr 8, 2013 | Toshiyuki Igarashi | UD 12/12 |
| 59 | Akira Yaegashi | IBF Light flyweight (108) | Dec 29, 2015 | Javier Mendoza | UD 12/12 |
| 60 | Shinsuke Yamanaka | WBC Bantamweight (118) | Nov 6, 2011 | Christian Esquivel | TKO 11/12 |
| 61 | Yota Sato | WBC Super flyweight (115) | Mar 27, 2012 | Suriyan Sor Rungvisai | UD 12/12 |
| 62 | Toshiyuki Igarashi | WBC Super flyweight (115) | Jul 16, 2012 | Sonny Boy Jaro | SD 12/12 |
| 62 | Toshiyuki Igarashi | The Ring Super flyweight | Jul 16, 2012 | Sonny Boy Jaro | SD 12/12 |
| 63 | Kohei Kono | WBA (Regular$^‡$) Super flyweight (115) | Dec 31, 2012 | Tepparith Singwancha | TKO 4/12 |
| 63 | Kohei Kono | WBA (Regular$^‡$) Super flyweight (115) – (2) | Mar 26, 2014 | Denkaosan Kaovichit | KO 8/12 |
| 64 | Ryo Miyazaki | WBA Mini flyweight (105) | Dec 31, 2012 | Pornsawan Porpramook | SD 12/12 |
| 65 | Takashi Miura | WBC Super featherweight (130) | Apr 8, 2013 | Gamaliel Díaz | TKO 9/12 |
| 66 | Tomoki Kameda | WBO Bantamweight (118) | Aug 1, 2013 | Paulus Ambunda | UD 12/12 |
| 67 | Naoya Inoue | WBC Light flyweight (108) | Apr 6, 2014 | Adrián Hernández | TKO 6/12 |
| 67 | Naoya Inoue | WBO Super flyweight (115) | Dec 12, 2014 | Omar Narváez | KO 2/12 |
| 67 | Naoya Inoue | IBF Bantamweight (118) | May 18, 2019 | Emmanuel Rodríguez | TKO 2/12 |
| 67 | Naoya Inoue | The Ring Bantamweight (118) | May 18, 2019 | Emmanuel Rodríguez | TKO 2/12 |
| 67 | Naoya Inoue | WBA (Super) Bantamweight (118) | Nov 7, 2019 | Nonito Donaire | UD 12/12 |
| 67 | Naoya Inoue | WBC Bantamweight (118) | Jun 7, 2022 | Nonito Donaire | TKO 2/12 |
| 67 | Naoya Inoue | WBO Bantamweight (118) | Dec 14, 2022 | Paul Butler | TKO 11/12 |
| 67 | Naoya Inoue | WBC Super bantamweight (122) | Jul 25, 2023 | Stephen Fulton | TKO 8/12 |
| 67 | Naoya Inoue | WBO Super bantamweight (122) | Jul 25, 2023 | Stephen Fulton | TKO 8/12 |
| 67 | Naoya Inoue | WBA (Super) Super bantamweight (122) | Dec 26, 2023 | Marlon Tapales | KO 10/12 |
| 67 | Naoya Inoue | IBF Super bantamweight (122) | Dec 26, 2023 | Marlon Tapales | KO 10/12 |
| 67 | Naoya Inoue | The Ring Super bantamweight (122) | Dec 26, 2023 | Marlon Tapales | KO 10/12 |
| 68 | Ryoichi Taguchi | WBA (Regular$^‡$) Light flyweight (108) later became Unified champion after winning against IBF champion Milan Melindo. | Regular$^‡$ Dec 31, 2014 | Alberto Rossel | UD 12/12 |
| 68 | Ryoichi Taguchi | WBA (Regular$^‡$) Light flyweight (108) later became Unified champion after winning against IBF champion Milan Melindo. | Unified Dec 31, 2017 | Milan Melindo | UD 12/12 |
| 68 | Ryoichi Taguchi | IBF Light flyweight (108) | Dec 31, 2017 | Milan Melindo | UD 12/12 |
| 68 | Ryoichi Taguchi | The Ring Light flyweight (108) | Dec 31, 2017 | Milan Melindo | UD 12/12 |
| 69 | Kosei Tanaka | WBO Mini flyweight (105) | May 30, 2015 | Julian Yedras | UD 12/12 |
| 69 | Kosei Tanaka | WBO Light flyweight (108) | Dec 31, 2016 | Moisés Fuentes | TKO 5/12 |
| 69 | Kosei Tanaka | WBO Flyweight (112) | Sep 24, 2018 | Sho Kimura | MD 12/12 |
| 69 | Kosei Tanaka | WBO Super flyweight (112) | Feb 24, 2024 | Christian Bacasegua | UD 12/12 |
| 70 | Yu Kimura | WBC Light flyweight (115) | Nov 28, 2015 | Pedro Guevara | SD 12/12 |
| 71 | Yukinori Oguni | IBF Super bantamweight (122) | Dec 31, 2016 | Jonathan Guzmán | UD 12/12 |
| 72 | Tatsuya Fukuhara | WBO Mini flyweight (105) | Feb 26, 2017 | Moises Calleros | SD 12/12 |
| 73 | Daigo Higa | WBC Flyweight (112) | May 20, 2017 | Juan Hernández | TKO 6/12 |
| 74 | Kenshiro Teraji | WBC Light flyweight (108) | May 20, 2017 | Ganigan López | MD 12/12 |
| 74 | Kenshiro Teraji | WBC Light flyweight (108) – (2) | Mar 19, 2022 | Masamichi Yabuki | KO 3/12 |
| 74 | Kenshiro Teraji | WBA (Super) Light flyweight (108) | Super Nov 1, 2022 | Hiroto Kyoguchi | TKO 7/12 |
| 74 | Kenshiro Teraji | WBA (Super) Light flyweight (108) | Unified Nov 30, 2022 | Status changed | Status changed |
| 74 | Kenshiro Teraji | The Ring Light flyweight (108) | Nov 1, 2022 | Hiroto Kyoguchi | TKO 7/12 |
| 74 | Kenshiro Teraji | WBC Flyweight (112) | Oct 13, 2024 | Cristofer Rosales | TKO 11/12 |
| 74 | Kenshiro Teraji | WBA Flyweight (112) | Mar 13, 2025 | Seigo Yuri Akui | TKO 12/12 |
| 75 | Hiroto Kyoguchi | IBF Mini flyweight (105) | Jul 23, 2017 | Jose Argumedo | UD 12/12 |
| 75 | Hiroto Kyoguchi | WBA (Super) Light flyweight (108) | Dec 31, 2018 | Hekkie Budler | TKO 10/12 |
| 75 | Hiroto Kyoguchi | The Ring Light flyweight (108) | Dec 31, 2018 | Hekkie Budler | TKO 10/12 |
| 76 | Sho Kimura | WBO Flyweight (112) | Jul 28, 2017 | Zhou Shiming | TKO 11/12 |
| 77 | Ryuya Yamanaka | WBO Mini flyweight (105) | Aug 27, 2017 | Tatsuya Fukuhara | UD 12/12 |
| 78 | Ryosuke Iwasa | IBF Super bantamweight (122) | Sep 13, 2017 | Yukinori Oguni | TKO 6/12 |
| 79 | Masayuki Ito | WBO Super featherweight (130) | Jul 28, 2018 | Christopher Díaz | UD 12/12 |
| 80 | Junto Nakatani | WBO Flyweight (112) | Nov 6, 2020 | Giemel Magramo | TKO 8/12 |
| 80 | Junto Nakatani | WBO Super flyweight (115) | May 20, 2023 | Andrew Moloney | KO 12/12 |
| 80 | Junto Nakatani | WBC Bantamweight (118) | Feb 24, 2024 | Alexandro Santiago | TKO 6/12 |
| 81 | Ryōta Murata | WBA (Regular$^‡$) Middleweight (160) later promoted to Super. | Regular$^‡$ Jan 1, 2021 | Primary champion vacant | Primary champion vacant |
| 81 | Ryōta Murata | WBA (Regular$^‡$) Middleweight (160) later promoted to Super. | Super Jan 6, 2021 | Promoted | Promoted |
| 82 | Masamichi Yabuki | WBC Light flyweight (108) | Sep 22, 2021 | Ken Shiro | TKO 10/12 |
| 82 | Masamichi Yabuki | IBF Light flyweight (108) | Oct 12, 2024 | Sivenathi Nontshinga | TKO 9/12 |
| 83 | Kenichi Ogawa | IBF Super featherweight (130) | Nov 27, 2021 | Azinga Fuzile | UD 12/12 |
| 84 | Masataka Taniguchi | WBO Mini flyweight (105) | Dec 14, 2021 | Wilfredo Méndez | TKO 11/12 |
| 85 | Takuma Inoue | WBA Bantamweight (118) | Apr 8, 2023 | Liborio Solís | UD 12/12 |
| 86 | Ginjiro Shigeoka | IBF Mini flyweight (105) | Oct 7, 2023 | Daniel Valladares | TKO 5/12 |
| 87 | Yudai Shigeoka | WBC Mini flyweight (105) | Oct 7, 2023 | Panya Pradabsri | UD 12/12 |
| 88 | Seigo Yuri Akui | WBA Flyweight (112) | Jan 23, 2024 | Artem Dalakian | UD 12/12 |
| 89 | Ryosuke Nishida | IBF Bantamweight (118) | May 4, 2024 | Emmanuel Rodríguez | UD 12/12 |
| 90 | Yoshiki Takei | WBO Bantamweight (118) | May 6, 2024 | Jason Moloney | UD 12/12 |
| 91 | Seiya Tsutsumi | WBA Bantamweight (118) | Oct 13, 2024 | Takuma Inoue | UD 12/12 |

### Note

* Interim titles are not included unless they get promoted to the official champion.
* For WBA champions, only champions in the WBA primary lineage are listed.

### List of WBA secondary champions

| No. | Name | Titles | Reign period | Opponent | Result | Primary champion/s during reign |
| 1 | Yusuke Kobori | WBA (Regular) Lightweight (135) | May 19, 2008 – Jan 3, 2009 | José Alfaro | TKO 3/12 | Nate Campbell Mar 8, 2008 – Kobori lost the title to Paulus Moses while Campbell was still the primary champion. |
| 2 | Nobuo Nashiro | WBA (Regular) Super flyweight (115) | Sep 15, 2008 – May 8, 2010 | Martín Castillo | TKO 10/12 | Cristian Mijares May 17, 2008 – Nov 1, 2008 |
| 2 | Nobuo Nashiro | WBA (Regular) Super flyweight (115) | Sep 15, 2008 – May 8, 2010 | Martín Castillo | TKO 10/12 | Vic Darchinyan Nov 1, 2008 – Nashiro lost the title to Hugo Cázares while Darchinyan was still the primary champion. |
| 3 | Koki Kameda | WBA (Regular) Bantamweight (118) | Dec 26, 2010 – Dec 6, 2013 | Alexander Muñoz | UD 12/12 | Anselmo Moreno Nov 19, 2010 – Kameda vacated the title and chose to move down to super flyweight after the WBA ordered him to fight Moreno. |
| 4 | Kazuto Ioka | WBA (Regular) Light flyweight (108) | Dec 31, 2012 – Jan 14, 2014 Becomes primary champion due to vacancy of the title. | José Alfredo Rodríguez | TKO 6/12 |
| 4 | Kazuto Ioka | WBA (Regular) Light flyweight (108) | Dec 31, 2012 – Jan 14, 2014 Becomes primary champion due to vacancy of the title. | José Alfredo Rodríguez | TKO 6/12 | Román González Nov 30, 2012 – Jan 14, 2014 |
| 5 | Kazuto Ioka (2) | WBA (Regular) Flyweight (112) | Apr 22, 2015 – Sep 14, 2016 Becomes primary champion due to vacancy of the title. | Juan Carlos Reveco | MD 12/12 |
| 5 | Kazuto Ioka (2) | WBA (Regular) Flyweight (112) | Apr 22, 2015 – Sep 14, 2016 Becomes primary champion due to vacancy of the title. | Juan Carlos Reveco | MD 12/12 | Juan Estrada Apr 6, 2013 – Sep 14, 2016 |
| 6 | Shun Kubo | WBA (Regular) Super bantamweight (122) | Apr 9, 2017 – Sep 3, 2017 | Nehomar Cermeño | RTD 12/12 | Guillermo Rigondeaux May 14, 2016 – Kubo lost the title to Daniel Roman while Rigondeaux was still the primary champion. |
| 7 | Ryōta Murata | WBA (Regular) Middleweight (160) | Oct 22, 2017 – Oct 20, 2018 | Hassan N'Dam N'Jikam | RTD 7/12 | Gennady Golovkin Jun 3, 2014 – Sep 15, 2018 |
| 7 | Ryōta Murata | WBA (Regular) Middleweight (160) | Oct 22, 2017 – Oct 20, 2018 | Hassan N'Dam N'Jikam | RTD 7/12 | Canelo Alvarez Sep 15, 2018 – Murata lost the title to Rob Brant while Álvarez was still the primary champion. |
| 8 | Naoya Inoue | WBA (Regular) Bantamweight (118) | May 25, 2018 – May 18, 2019 Status changed to Unified champion after winning against IBF champion Emmanuel Rodríguez. | Jamie McDonnell | TKO 1/12 | Ryan Burnett Oct 21, 2017 – Nov 3, 2018 |
| 8 | Naoya Inoue | WBA (Unified) Bantamweight (118) | May 18, 2019 – Nov 7, 2019 Became Super after winning against Super champion Nonito Donaire. | Emmanuel Rodríguez | TKO 2/12 | Nonito Donaire Nov 3, 2018 – Nov 7, 2019 |
| 9 | Ryōta Murata (2) | WBA (Regular) Middleweight (160) | Jul 12, 2019 – Jan 1, 2021 Becomes primary champion due to vacancy of the title. | Rob Brant | TKO 2/12 | Canelo Alvarez Sep 15, 2018 – Jan 1, 2021 |

## List of women's professional boxing world champions

The following is a list of female Japanese boxing champions who have held titles from one or more of the "Big Four" organizations (WBA, WBC, IBF, WBO) and The Ring.
* Current world champion
| No. | Name | Titles | Date | Opponent | Result |
| 1 | Nanako Kikuchi | WBC Mini flyweight (105) | Nov 7, 2005 | Nongmai Sor Siriporn | TKO 7/10 |
| 2 | Naomi Togashi | WBC Light flyweight (108) | Jul 13, 2008 | Kim Jin | UD 10/10 |
| 3 | Momo Koseki | WBC Atomweight (102) | Aug 11, 2008 | Winyu Paradorn Gym | UD 10/10 |
| 3 | Momo Koseki | WBA Atomweight (102) | Oct 22, 2015 | Ayaka Miyao | UD 10/10 |
| 3 | Momo Koseki | WBC Mini flyweight (105) | Dec 17, 2017 | Yuko Kuroki | UD 10/10 |
| 4 | Tenkai Tsunami | WBA Super flyweight (115) | Feb 26, 2009 | Zhang Xi Yan | SD 10/10 |
| 4 | Tenkai Tsunami | WBO Light flyweight (108) | Mar 8, 2018 | Chaoz Minowa | RTD 8/10 |
| 5 | Etsuko Tada | WBA Mini flyweight (105) | Apr 11, 2009 | Son Cho-Rong | UD 10/10 |
| 5 | Etsuko Tada | IBF Mini flyweight (105) | Dec 11, 2015 | Kareli Lopez | UD 10/10 |
| 5 | Etsuko Tada | WBO Mini flyweight (105) | Dec 1, 2018 | Kayoko Ebata | UD 10/10 |
| 5 | Etsuko Tada | WBO Mini flyweight (105) — (2) | Dec 3, 2020 | Ayaka Miyai | TKO 3/10 |
| 6 | Naoko Fujioka | WBC Mini flyweight (105) | May 8, 2011 | Anabel Ortiz | RTD 8/10 |
| 6 | Naoko Fujioka | WBA Super flyweight (115) | Nov 13, 2013 | Naoko Yamaguchi | UD 10/10 |
| 6 | Naoko Fujioka | WBO Bantamweight (118) | Oct 19, 2015 | Hee Jung Yuh | UD 10/10 |
| 6 | Naoko Fujioka | WBA Flyweight (112) | Mar 13, 2017 | Isabel Millan | TKO 10/10 |
| 6 | Naoko Fujioka | WBO Light flyweight (108) | Dec 1, 2017 | Yokasta Valle | UD 10/10 |
| 7 | Mari Ando | WBA Atomweight (102) | Sep 22, 2011 | Amara Naktaku | UD 10/10 |
| 7 | Mari Ando | WBC Mini flyweight (105) | Dec 14, 2013 | Jasseth Noriega | SD 10/10 |
| 8 | Naoko Yamaguchi | WBA Super flyweight (115) | Jul 9, 2012 | Tenkai Tsunami | UD 10/10 |
| 9 | Ayaka Miyao | WBA Atomweight (102) | Sep 16, 2012 | Mari Ando | UD 10/10 |
| 10 | Shindo Go | WBC Flyweight (112) | May 19, 2013 | Renáta Szebelédi | UD 10/10 |
| 11 | Naoko Shibata | IBF Light flyweight (108) | Nov 14, 2013 | Alondra Garcia | UD 10/10 |
| 12 | Mako Yamada | WBO Mini flyweight (105) | Feb 9, 2014 | Hong Su-Yun | SD 10/10 |
| 13 | Nao Ikeyama | WBO Atomweight (102) | May 17, 2014 | Jessebelle Pagaduan | UD 10/10 |
| 14 | Yuko Kuroki | WBC Mini flyweight (105) | May 17, 2014 | Mari Ando | UD 10/10 |
| 15 | Kumiko Seeser Ikehara | WBO Mini flyweight (105) | Sep 20, 2014 | Gretchen Abaniel | SD 10/10 |
| 16 | Yunoka Furukawa | WBA Atomweight (102) | Aug 13, 2016 | Satomi Nishimura | TKO 3/10 |
| 17 | Nana Yoshikawa | WBO Flyweight (112) | Oct 9, 2016 | Lee Eun Hye | MD 10/10 |
| 18 | Kayoko Ebata | WBO Mini flyweight (105) | May 19, 2017 | Erika Hanawa | UD 10/10 |
| 19 | Mika Iwakawa | WBO Atomweight (102) | Jul 29, 2018 | Nao Ikeyama | SD 10/10 |
| 21 | Saemi Hanagata | IBF Atomweight (102) | Sep 29, 2018 | Yuko Kuroki | SD 10/10 |
| 22 | Kasumi Saeki | WBO Mini flyweight (105) | Apr 27, 2019 | Elizabeth Lopez | TKO 6/10 |
| 23 | Miyo Yoshida | WBO Super flyweight (115) | Jun 19, 2019 | Casey Morton | UD 10/10 |
| 24 | Tamao Ozawa | WBO Super flyweight (115) | May 30, 2022 | Miyo Yoshida | SD 10/10 |
| 25 | Sumire Yamanaka | IBF Atomweight (102) | Jan 12, 2024 | Mika Iwakawa | UD 10/10 |

## Current titleholders in world boxing sanctioning bodies
### Major (WBA, WBC, IBF, WBO)
#### Men's World Champions

| Name | Organization | Division | Date won |
| Naoya Inoue | WBA (Super), WBC, IBF, WBO, and The Ring | Super bantamweight | July 25, 2023 |
| Junto Nakatani | WBC | Bantamweight | February 24, 2024 |
| Ryosuke Nishida | IBF | Bantamweight | May 4, 2024 |
| Yoshiki Takei | WBO | Bantamweight | May 6, 2024 |
| Masamichi Yabuki | IBF | Light flyweight | October 12, 2024 |
| Ken Shiro | WBA and WBC | Flyweight | October 13, 2024 |
| Seiya Tsutsumi | WBA | Bantamweight | October 13, 2024 |

#### Women's World Champions

| Name | Organization | Division | Date won |
| Mizuki Hiruta | WBO | Super Flyweight | December 1, 2022 |
| Miyo Yoshida | IBF | Bantamweight | December 9, 2023 |
| Sumire Yamanaka | IBF | Atomweight | January 12, 2024 |
| Eri Matsuda | WBO, WBA | Atomweight | January 12, 2024 |