Sidney Thornton (September 2, 1954 – January 29, 2023) was an American professional football player who was selected by the Pittsburgh Steelers in the 2nd round (48th overall) of the 1977 NFL draft. A 5'11", 230 lb. running back from Northwestern State University in Louisiana, he played in 6 NFL seasons from 1977 to 1982 for the Steelers, winning two Super Bowl titles with the team. Thornton returned to pro football in 1984, playing one season with the Oklahoma Outlaws and rushing for 288 yards on 101 carries (2.9 yard per carry average). He was second on the team in rushing, finishing behind Ernest Anderson. Anderson rushed for ten more yards during the season than Thornton, however, Thornton led Outlaws in rushing touchdowns, with four. Thornton died on January 29, 2023, at the age of 68.