Michael "Marcus" Johnson (born December 1, 1981) is an American college football coach and former professional player who was a guard in the National Football League (NFL). He is the offensive line coach for Purdue University, a position he has held since 2023. He played college football for the Ole Miss Rebels and was selected by the Minnesota Vikings in the second round of the 2005 NFL draft. Johnson was also a member of the Oakland Raiders, Tampa Bay Buccaneers and Hartford Colonials. He is the younger brother of CFL offensive lineman Belton Johnson.