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 (1993-2011), K-1 Global (2012–2023) and later by K-1 (2014-present) following the former's dissolution. The list does not contain K-1's mixed martial arts branch Hero's and DREAM champions.

K-1 Super Heavyweight Championship

 * Weight limit: Unlimited

K-1 Heavyweight Championship

 * Weight limit: 100 kg

K-1 Cruiserweight Championship

 * Weight limit: 90 kg

K-1 Middleweight Championship

 * Weight limit: 75 kg

K-1 Super Welterweight Championship

 * Weight limit: 70 kg

K-1 Welterweight Championship

 * Weight limit: 67.5 kg

K-1 World GP Super Lightweight Championship

 * Weight limit: 65 kg

K-1 Lightweight Championship

 * Weight limit: 62.5 kg

K-1 Super Featherweight Championship

 * Weight limit: 60 kg

K-1 Featherweight Championship

 * Weight limit: 57.5 kg

K-1 Super Bantamweight Championship

 * Weight limit: 55 kg

K-1 Bantamweight Championship

 * Weight limit: 53 kg

K-1 Women's Flyweight Championship

 * Weight limit: 52 kg

K-1 Women's Atomweight Championship

 * Weight limit: 45 kg

Openweight
K-1 and FEG (1993-2010), K-1 (2024-present)

K-1 WORLD GRAND PRIX : Finalists
K-1 and FEG (1993-2010), K-1 (2024-present)

K-1 GP Preliminary Tournament Champions
Legend:

-70kg
K-1 and FEG (2002-2010), K-1 (2024-present)

K-1 WORLD MAX : Finalists
K-1 and FEG (2002-2010), K-1 (2024-present)

K-1 MAX Preliminary Tournament Champions
Legend:

K-1 World Tournament Champions
K-1 WORLD GP JAPAN (2014-2023), K-1 WORLD MAX (2024-present)

Openweight
-95kg

-85kg

-85kg : Light Heavyweight

-70kg

K-2
Weight limit: 82 kg

K-3
Weight limit: 75 kg