Donn Grimm is a retired American football player. He is best known for his role at linebacker, that helped Notre Dame win the 1988 Consensus National Championship. He was also a four-time letterman with the Irish. He was awarded each year from 1987 until his senior year in 1990. In 1989, he came in second on the team for tackles. After graduation, he later signed with the Phoenix Cardinals as a rookie free agent in 1991.
Donn is the brother of, Pro Football Hall of Famer, Russ Grimm who mentioned him in his enshrinement speech at the Hall in August 2010. He is also the uncle of Cody Grimm, a safety with the Tampa Bay Buccaneers.