The 1991 Arizona State Sun Devils football team was an American football team that represented Arizona State University in the Pacific-10 Conference (Pac-10) during the 1991 NCAA Division I-A football season. In their fourth season under head coach Larry Marmie, the Sun Devils compiled a 6–5 record (4–4 against Pac-10 opponents), finished in fifth place in the Pac-10, and outscored their opponents by a combined total of 218 to 210. The team's statistical leaders included Bret Powers with 1,500 passing yards, George Montgomery with 475 rushing yards, and Eric Guliford with 801 receiving yards.