Karl Moore (born October 24, 1991) is a Northern Irish mixed martial artist who competes in the Light Heavyweight division. He has also competed in Cage Warriors (CW), where he was the Light Heavyweight Championship, in Bellator MMA, where he was a Light Heavyweight Title contender, and PFL.

Born and raised in the streets of Twinbrook, Belfast, Moore's journey into the world of combat sports began with wrestling matches on the gritty roads of Belfast. Influenced by the larger-than-life personas of 'Stone Cold' Steve Austin and his father's background in martial arts, Moore found himself drawn to the raw intensity of MMA at a young age. Despite initially dabbling in various disciplines like BJJ, judo, and Thai boxing, it was the all-encompassing nature of mixed martial arts that truly captivated him.

At 16, Moore took the plunge into formal MMA training at Fight Academy Ireland Gym in Poleglass, where his passion for the sport solidified. However, the path to success was far from easy. Moore endured hardships typical of aspiring fighters: working multiple jobs, scraping by on minimal income, and even resorting to sleeping on a gym mattress. Moore's life took a significant turn when he crossed paths with Gerry Storey, a legendary figure in Belfast's boxing scene. Under Storey's tutelage, Moore honed his skills and showcased his talent in the ring, earning a victory in his lone boxing bout organized by Storey.

Moore started his professional MMA career in 2011 at Battlezone FC 4, where he clinched the Battlezone FC Light Heavyweight Championship with a first-round triangle choke victory over Rimantas Pukas. He would continue his win streak across the UK regionals, most notably defeating future UFC fighter Cyril Asker. However, Moore faced a setback at BAMMA 22 on September 19, 2015, where he succumbed to a guillotine choke submission by Paul Craig in the second round. Moore bounced back with two first round finishes before challenging for the Cage Warriors Light Heavyweight Championship at Cage Warriors 81 on March 4, 2017, where he claimed the vacant title with a hard-fought unanimous decision victory over Josh Clark.

Transitioning to the heavyweight division, Moore faced Mauro Cerilli for the Cage Warriors Heavyweight Championship at Cage Warriors 92 on March 24, 2018, in London, England. Despite his efforts, Moore fell short, suffering a first-round KO due to a devastating knee and subsequent punches.

Moore signed a contract with Bellator MMA, and made his promotional debut on September 27, 2019, at Bellator 227 against Lee Chadwick. He won the fight by split decision.

Moore faced Karl Albrektsson on September 23, 2022, at Bellator 285. He won the fight via face crank submission in the second round.

Moore faced Maciej Różański on February 25, 2023, at Bellator 291. He won the fight by unanimous decision.