Marcus LeMarr Allen (born March 26, 1960 in San Diego, California) is a former American football player and, until recently, was affiliated with CBS as a game analyst. As a professional, Allen ran for 12,243 yards and caught 587 passes for 5,412 yards during his career for both the Los Angeles Raiders and the Kansas City Chiefs from 1982 to 1997. He scored 145 touchdowns, including a then league record 123 rushing touchdowns, and was elected to six Pro Bowls over the course of his career. He was also a fairly good passer for a running back, completing 12 of 27 passes for 285 yards and six touchdowns, with only one interception. Allen was the first player ever to gain more than 10,000 rushing yards and 5,000 receiving yards during his career.

Allen is considered as one of the greatest goal line and short-yard runners in National Football League history.He was inducted into the College Football Hall of Fame in 2000 and the Pro Football Hall of Fame in 2003. His younger brother, Damon Allen, played quarterback for 23 seasons in the Canadian Football League and is professional football's all-time leader in passing yards.

Allen is a member of the Laureus World Sports Academy