Michael Dennis Dunne (born October 27, 1962 in South Bend, Indiana) is a former professional baseball player who pitched in the major leagues from 1987-1990 and in 1992. He was a member of the 1984 U.S. Olympic Baseball Team.
Dunne had a fine rookie season with the Pirates, going 13-6 with a 3.03 ERA and giving just 143 hits in 164 innings. Those solid numbers led to him finishing second in the National League Rookie of the Year voting. On April 21, 1989, he was traded by the Pittsburgh Pirates with minor leaguer Mark Merchant and Mike Walker to the Seattle Mariners for Rey Quiñones and Bill Wilkinson.
Injuries then hampered much of the rest of his career. He was dealt to Seattle Mariners, and later pitched for both the San Diego Padres and the Chicago White Sox. His last big league game was in 1992 for the White Sox.
His big league career covered five years and he finished with a 25-30 record and a 4.08 ERA. He pitched in 85 games, 76 of them as a starter, gave 471 hits in 474 innings, fanned 205 and walked 225.