Brock Orville Larson (born August 23, 1977) is a retired American professional mixed martial artist who competed in the Welterweight and Middleweight divisions.

The two later competed in a Minnesota Martial Arts Academy submission tournament, with each winning and earning invites to train with future UFC Lightweight Champion Sean Sherk.

[3] Larson made his professional mixed martial arts debut in 2002 and compiled an undefeated record of 15–0 while competing in the regional circuit before being signed by the UFC.

[5] After going 3-0 in regional competition after his UFC release, Larson faced future Strikeforce Welterweight Champion Tarec Saffiedine on September 11, 2010, at Shark Fights 13 and lost via unanimous decision.

Larson was signed by ONE FC and made his promotional debut against Melvin Manhoef at ONE Fighting Championship: Kings and Champions on April 5, 2013, and won via unanimous decision.

He challenged Derrick Krantz for the Legacy FC Welterweight Championship, but ended up losing the bout via knockout in the third round.

He was in trouble early on as Coyle locked on a guillotine choke; however, Larson survived the various submission attempts and ended up winning the fight via TKO in the first round.