Kai Stewart (born June 17, 2000) is an American bare-knuckle boxer and mixed martial artist. He currently competes in the Bare Knuckle Fighting Championship in the featherweight division, where he is the current and inaugural BKFC Featherweight Champion. As a mixed martial artist, he has competed in the welterweight division. As of January 29, 2026, he is #2 in the BKFC men's pound-for-pound rankings.
Kai Stewart attended Charles M. Russell High School, where he was a three-time Class AA Montana state finalist in wrestling, including a 138-lb state championship in 2018.
Stewart attended Minot State University in his first year, where he was a member of the MSU Beavers wrestling team. He compiled a 2-3 record as a freshman. He transferred to the University of Providence in his 2020 sophomore year.
Stewart made his professional MMA career against Frank Meno on December 10, 2022, at Fusion Fight League's event, entitled Seasons Beatings Great Falls. He won the bout by rear-naked choke.
In his BKFC debut, Stewart faced Darrick Gates at BKFC Fight Night 1 on October 9, 2021. He won the fight via first-round knockout.
Stewart then faced Daniel Gary at on April 30, 2022. He won the fight via first-round knockout.
Stewart next faced Rusty Crowder at on September 10, 2022. He won the bout via split decision.
Stewart faced Louie Lopez for the inaugural BKFC Featherweight Championship at on June 9, 2023. He won the bout by unanimous decision to win the championship. This fight earned him the Fight of the Night award.
In his first title defense, Stewart faced Howard Davis on December 2, 2023, at . He won the bout by unanimous decision. This fight earned him another Fight of the Night award.
Stewart defended his title against Bryan Duran on June 21, 2024 in the main event of . He won the bout by unanimous decision. This fight earned him another Fight of the Night award.
Stewart made the third successful defense of his BKFC featherweight title by unanimous decision against Jimmie Rivera on November 9, 2024 at BKFC on DAZN 2.
Stewart defended his title for the fourth time against undefeated contender Tommy Strydom on April 5, 2025 at . He won the fight by unanimous decision.
Stewart made the fifth defense of his BKFC featherweight title against current unbeaten BKFC Europe Featherweight Champion Nico Gaffie at BKFC 87 on March 20, 2026. He won the fight by unanimous decision.
|- |Win |align=center|1âÂÂ0 |Frank Meno |Submission (rear-naked choke) |FFL Season Beatings Great Falls | |align=center|2 |align=center|0:00 |Great Falls, Montana, United States |
|- |Win |align=center|9âÂÂ0 |Nico Gaffie |Decision (unanimous) | | |align=center|5 |align=center|2:00 |Hollywood, Florida, United States | |- |Win |align=center|8âÂÂ0 |Tommy Strydom |Decision (unanimous) | | |align=center|5 |align=center|2:00 |Dubai, United Arab Emirates | |- |Win |align=center|7âÂÂ0 |Jimmie Rivera |Decision (unanimous) | | |align=center|5 |align=center|2:00 |Billings, Montana, United States | |- |Win |align=center|6âÂÂ0 |Bryan Duran |Decision (unanimous) | | |align=center|5 |align=center|2:00 |Hollywood, Florida, United States | |- |Win |align=center|5âÂÂ0 |Howard Davis |Decision (unanimous) | | |align=center|5 |align=center|2:00 |Salt Lake City, Utah, United States | |- |Win |align=center|4âÂÂ0 |Louie Lopez |Decision (unanimous) | | |align=center|5 |align=center|2:00 |Great Falls, Montana, United States | |- |Win |align=center|3âÂÂ0 |Rusty Crowder |Decision (split) | | |align=center|5 |align=center|2:00 |Great Falls, Montana, United States | |- |Win |align=center|2âÂÂ0 |Daniel Gary |KO (punches) | | |align=center|1 |align=center|1:10 |Great Falls, Montana, United States | |- |Win |align=center|1âÂÂ0 |Darrick Gates |TKO (punches) | | |align=center|1 |align=center|1:24 |Billings, Montana, United States |