List of K-1 champions
This is the list of all K-1 champions. Included are the K-1 World Grand Prix and K-1 World MAX champions as well as all the preliminary tournament winners from the events promoted by K-1 and FEG and later by K-1 Global following the former's dissolution. The list does not contain K-1's mixed martial arts branch Hero's and DREAM champions.
Current champions
K-1 Championship
K-1 Super Heavyweight Championship
| Date | Champion | Nationality | Event | Location | Title Fights / № of Defenses |
| 2007-03-04 - 2013-06-26 | Semmy Schilt |  Netherlands | K-1 World GP 2010 in Yokohama K-1 World GP 2008 in Fukuoka K-1 World Grand Prix 2008 in Yokohama K-1 World Grand Prix 2007 in Amsterdam K-1 World Grand Prix 2007 in Yokohama | Yokohama, Japan Fukuoka, Japan Yokohama, Japan Amsterdam, Netherlands Yokohama, Japan | 4 2010-04-03 Errol Zimmerman - 3 2008-06-29 Jérôme Le Banner - 2 2008-04-13 Mark Hunt - 1 2007-06-23 Mighty Mo - 2007-03-04 Ray Sefo -  New Zealand |
K-1 Heavyweight Championship
| Date | Champion | Nationality | Event | Location | Title Fights / No. of Defenses |
| 2007-04-28 - 2008-12-17 | Badr Hari |  Morocco | K-1 World GP 2007 in Hawaii K-1 World GP 2008 in Fukuoka | Honolulu, Hawaii, USA Fukuoka, Japan | |
| 2009-03-28 - 2011-10-01 | Kyotaro Fujimoto |  Japan | K-1 World GP 2009 in Yokohama K-1 World GP 2010 in Yokohama | Yokohama, Japan Yokohama, Japan | |
| 2017-11-23 - 2018-03-21 | Antonio Plazibat |  Croatia | K-1 World GP 2017 Japan Heavyweight Championship Tournament | Saitama, Japan | 2017-11-23 Ibrahim El Bouni - |
| 2018-03-21 - current | Roel Mannaart | Netherlands | K-1 K'Festa 1 K-1 World GP 2019 Yokohamatsuri | Saitama, Japan Yokohama, Japan | 2018-03-21 Antonio Plazibat - 1 2019-11-24 Chris Bradford - |
K-1 Cruiserweight Championship
| Date | Champion | Nationality | Event | Location | Title Fights / No. of Defenses |
| 2018-09-24 - current | Sina Karimian |  Iran | K-1 World GP 2018 -90kg World Tournament | Tokyo, Japan Saitama, Japan Tokyo, Japan | 2018-09-24 Boubaker El Bakouri - 1 2019-03-10 Hisaki Kato - 2 2020-03-22 Ryo Aitaka - |
K-1 Super Welterweight Championship
| Date | Champion | Nationality | Event | Location | Title Fights / № of Defenses |
| 2015-07-04 - 2016-12-06 | Marat Grigorian |  Armenian | K-1 World GP 2015 -70kg Championship Tournament | Tokyo, Japan | 2015-07-04 Jordann Pikeur - Netherlands |
| 2017-06-18 - 2019 | Chingiz Allazov |  Belarusian | K-1 World GP 2017 -70kg Championship Tournament | Tokyo, Japan Saitama, Japan | 2017-06-18 Yasuhiro Kido - Japan 1 2018-03-21 Hinata - Japan |
| 2020-03-22 - current | Minoru Kimura |  Brazilian | Saitama, Japan | 2020-03-22 Hiromi Wajima - Japan |
K-1 Welterweight Championship
| Date | Champion | Nationality | Event | Location | Title Fights / № of Defenses |
| 2017-09-18 - current | Yuta Kubo | Japan | K-1 World GP 2017 Welterweight Championship Tournament | Tokyo, Japan Saitama, Japan Tokyo, Japan Saitama, Japan | 2017-09-18 Mohan Dragon -  Nepal1 2018-03-21 Melsik Baghdasaryan - Armenia2 2019-03-10 Yasuhiro Kido - Japan3 2020-03-22 Jordann Pikeur - Netherlands |
K-1 Super Lightweight Championship
| Date | Champion | Nationality | Event | Location | Title Fights / № of Defenses |
| 2014-11-03 - 2017-06-18 | Kaew Fairtex |  Thailand | K-1 World GP 2014 -65kg Championship Tournament K-1 World GP 2015 The Championship K-1 World GP 2017 Super Bantamweight Championship Tournament | Tokyo, Japan Tokyo, Japan Tokyo, Japan | 2014-11-03 Yasuomi Soda - Japan 1 2015-11-21 Minoru Kimura -  Brazil 2 2017-04-22 Hideaki Yamazaki - Japan |
| 2017-06-18 - 2018-07 | Masaaki Noiri | Japan | K-1 World GP 2017 -70kg Championship Tournament | Tokyo, Japan Saitama, Japan | 2017-06-18 Kaew Fairtex - Thailand 1 2018-03-21 Tetsuya Yamato - Japan |
| 2018-11-03 - 2019-06-30 | Kaew Fairtex | Thailand | K-1 World GP 2018 –65 kg World Tournament | Saitama, Japan | 2018-11-03 Daizo Sasaki - Japan |
| 2019-06-30 - current | Rukiya Anpo | Japan | K-1 World GP 2019 Super Bantamweight Championship Tournament K-1 World GP 2019 Inaugural Women's Flyweight Championship Tournament | Tokyo, Japan Nagoya, Japan Saitama, Japan | 2019-06-30 Kaew Fairtex - Thailand 1 2019-12-28 Kaew Fairtex - Thailand2 2020-03-22 Fukashi - Japan |
K-1 Lightweight Championship
| - | - | - | - | - | |
| Date | Champion | Nationality | Event | Location | Title Fights / № of Defenses |
| 2017-02-25 - 2018-03-21 | Wei Rui |  China | K-1 World GP 2017 Super Middleweight Championship Tournament K-1 World GP 2017 Lightweight Championship Tournament, Final | Tokyo, Japan Tokyo, Japan | 1 2017-06-18 Gonnapar Weerasakreck - Thailand 2017-02-25 Ren Hiramoto - Japan |
| 2018-03-21 - 2019-03-10 | Koya Urabe | Japan | Saitama, Japan | 2018-03-21 Wei Rui - China | |
| 2019-03-10 - Present | Kenta Hayashi | Japan | Tokyo, Japan | 2019-03-10 Koya Urabe - Japan |
K-1 Super Featherweight Championship
| Date | Champion | Nationality | Event | Location | Title Fights / № of Defenses |
| 2015-01-18 - 2015-11-21 | Koya Urabe | Japan | K-1 World GP 2015 -60kg Championship Tournament | Tokyo, Japan | 2015-01-18 Hirotaka Urabe - Japan |
| 2015-11-21 - 2017-02-25 | Hirotaka Urabe | Japan | K-1 World GP 2015 The Championship | Tokyo, Japan | 2015-11-21 Koya Urabe - Japan |
| 2017-02-25 - 2018-02-03 | Taiga | Japan | K-1 World GP 2017 Lightweight Championship Tournament | Tokyo, Japan | 2017-02-25 Hirotaka Urabe - Japan |
| 2018-03-21 - current | Takeru | Japan | K-1 World GP 2018 –62.5 kg World Tournament | Saitama, Japan Osaka, Japan | 2016-09-19 Kosuke Komiyama - Japan 1 2018-12-08 Koji - |
K-1 Featherweight Championship
| Date | Champion | Nationality | Event | Location | Title Fights / № of Defenses |
| 2016-11-03 - 2018-03-21 | Takeru | Japan | K-1 World GP 2016 Super Featherweight World Tournament K-1 World GP 2017 Welterweight Championship Tournament | Tokyo, Japan Tokyo, Japan | 2016-11-03 Kaito Ozawa - Japan 1 2017-09-18 Wang Junguang - China |
| 2018-06-17 - 2019-08-25 | Yuta Murakoshi | Japan | K-1 World GP 2018 -57.5kg World Tournament | Tokyo, Japan Saitama, Japan | 2018-06-17 Haruma Saikyo - Japan 1 2019-03-10 Hirotaka Urabe - Japan |
| 2019-11-24 - current | Yuki Egawa | Japan | K-1 World GP 2019 Yokohamatsuri | Yokohama, Japan | 2019-11-24 Jawsuayai Sor.Dechaphan - Thailand |
K-1 Super Bantamweight Championship
| Date | Champion | Nationality | Event | Location | Title Fights / № of Defenses |
| 2015-04-19 - 2016-08-28 | Takeru | Japan | K-1 World GP 2015 The Championship K-1 World GP 2015 -55kg Championship Tournament | Tokyo, Japan Tokyo, Japan | 2015-04-19 Taiga - Japan 1 2015-11-21 Charles Bongiovanni -  France |
| 2017-04-22 - current | Yoshiki Takei | Japan | K-1 World GP 2017 Super Bantamweight Championship Tournament | Tokyo, Japan Saitama, Japan | 2017-04-22 Kenji Kubo - Japan 1 2018-03-21 Kenji Kubo - Japan |
K-1 World Grand Prix Champions
K-1 World Grand Prix Tables| Fighters | Titles | Runner-up | Third place | Appearance in Finals |
| Ernesto Hoost | 4 | 1 | 3 | 11 |
| Semmy Schilt | 4 | 0 | 1 | 5 |
| Peter Aerts | 3 | 3 | 2 | 17 |
| Remy Bonjasky | 3 | 0 | 3 | 7 |
 Andy Hug | 1 | 2 | 0 | 3 |
 Mirko Filipović | 1 | 1 | 0 | 4 |
| Branko Cikatić | 1 | 0 | 1 | 2 |
| Mark Hunt | 1 | 0 | 1 | 2 |
| Alistair Overeem | 1 | 0 | 1 | 2 |
| Nation | Titles | Runner-up | Third place | Total |
| Netherlands | 15 | 4 | 10 | 29 |
| Croatia | 2 | 1 | 1 | 4 |
| Switzerland | 1 | 2 | 0 | 3 |
| New Zealand | 1 | 0 | 1 | 2 |