Luke Joseph Cummo (born April 27, 1980 in New Hyde Park, New York), nicknamed "The Silent Assassin", is a mixed martial arts fighter who appeared in the second season of the reality TV series The Ultimate Fighter on Spike TV. After winning two exhibition fights, he made it to the finals where he was defeated by Joe Stevenson by decision in a close bout. Although it wasn't televised on the Ultimate Fighter final, pay scale records indicate that Cummo was awarded the 6 figure contract as well.

Cummo gained recognition on the show due to his personality, unorthodox diet (which according to Joe Rogan, includes urine therapy when sick), his striking ability and his love of comic books. He was also the last person picked for a team on the show, fighting throughout the show as the underdog.