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Mark W. Messner (born December 29, 1965) is a former American football player who played in the National Football League (NFL) as a linebacker for the Los Angeles Rams during the 1989 NFL season. He sustained a serious knee injury in the 1989-90 NFC Championship Game against the San Francisco 49ers and never played in another game.
Messner played college football for the University of Michigan. He started every game, 49 in all, at defensive tackle for Michigan from 1985 to 1988. He was the first position player ever to be selected as a first-team All-Big Ten Conference player all four years. He was selected as a first-team All-American by the Sporting News in 1987 and was a consensus All-American in 1988. He set still holds Michigan records for quarterback sacks in a game (5), career tackles for loss (70), and career sacks (36). He was inducted into the University of Michigan Athletic Hall of Honor in 2014.