Maurice Smith (born December 13, 1961) is a retired American kickboxer and mixed martial artist. In kickboxing, he held the WKC (World Kickboxing Council) world light heavyweight championship, the WKA (World Kickboxing Association) world heavyweight championship, and the ISKA (International Sport Karate Association) world heavyweight championship. In mixed martial arts, he held the Heavyweight championship in Battlecade Extreme Fighting and the UFC, and became a member of the UFC Hall of Fame in 2017. A professional competitor since 1980, Smith has formerly competed in kickboxing for the companies All Japan Enterprise and K-1, Pancrase, RINGS, PRIDE, Strikeforce, International Fight League and RFA.

Raised in Seattle, Washington, Smith got into martial arts at the age of 13 after watching Bruce Lee's Chinese Connection, and having had to retreat from a fight. He trained in karate, kung fu, and taekwondo, until he found the sport of kickboxing at age 18. Smith attended West Seattle High School, where he played football and participated in gymnastics.

Smith won his first seven amateur kickboxing matches and then turned professional. His first fight was on March 4, 1982 against World Kickboxing Council's Light Heavyweight Champion Tony Morelli, who defeated him by decision after the seventh round. Seeing he had lost due to his lack of cardio, Smith started to train extensively to improve it, and fourteen months later, he went to his rematch as a new fighter. He then defeated Morelli by KO via roundhouse kick also in the seventh round, winning the championship.

Later that year, he was called for a non-title fight in Japan against the renowned Don "The Dragon" Wilson, and although Smith lost the fight, he had shown heads in the kickboxing world that he was on the way up. Maurice moved up a weight class and won the World Kickboxing Association Heavyweight Championship from Travis Everett, knocking him out via low kicks in 1983.

In 1984, Smith went to compete in Holland, beating Marcel Swank in the first round.

Smith went ten straight years without a loss, defended the WKA title against Kevin Rosier, Steve Tremblay, Raymond Homsey, Dino Homsey and Bill Morrison (kickboxer). was ranked number one in the world in full contact kickboxing by ISKA in 1987.

He also had a notable win in 1991 over Stan Longinidis who, at the time, was tearing through the ranks and was regarded as a super up and coming fighter. Maurice won this 12 round match by split decision after coming back from a knockdown in the first round by Stan and surviving an early onslaught.

In 1993, Smith was invited to the K-1 Grand Prix '93 along with seven of the world's best Light Heavyweight and Heavyweight kickboxers. Smith won his first match by defeating Japanese fighter Toshiyuki Atokawa in the quarterfinals by unanimous decision. In the semifinals he met Dutch fighter and future K-1 legend, Ernesto Hoost, where after a hard-fought battle Smith was knocked out by left highkick in the final round, ending his tournament.