The 1991 Michigan Wolverines football team represented the University of Michigan in the 1991 NCAA Division I-A football season. The team's head coach was Gary Moeller. The Wolverines played their home games at Michigan Stadium. The team was undefeated in the Big Ten Conference and was led by Heisman Trophy-winner Desmond Howard, Butkus Award-winner Erick Anderson and national statistical champion Elvis Grbac. The team won the fourth of five consecutive Big Ten championships. The team lost to national champion Washington Huskies in the 1992 Rose Bowl.

Gary Oscar Moeller was an American football coach best known for being head coach at the University of Michigan from 1990 to 1994. During his five seasons at Michigan, he won 44 games, lost 13 and tied 3 for a winning percentage of .758. In Big Ten Conference play, his teams won 30 games, lost 8, and tied 2 for a winning percentage of .775, and won or shared conference titles in 1990, 1991 and 1992. He left Michigan in 1995 following a drunken incident. Moeller also coached in professional football and was the head coach of the Detroit Lions for part of the 2000 season. He was the father of former Cleveland Browns offensive line coach Andy Moeller.