Michael Denis Wegener (October 8, 1946 – December 6, 2023) was an American former Major League Baseball pitcher.

The 6 ft 4 in (1.93 m), 215 lb (98 kg) right-hander was signed by the Baltimore Orioles before the 1964 season, selected by the Philadelphia Phillies from Baltimore in the 1964 first-year draft (November 30), and, four years later, chosen by the Montreal Expos as the 15th pick in the 1968 MLB expansion draft.

Wegener played for the Expos from 1969 to 1970, appearing in 57 games, 42 of them starts.

Wegener is perhaps best known for giving up Willie Mays's 3,000th hit on July 18, 1970.

Mike passed away December 6, 2023 in Fort Collins, Colorado after a 32-year battle with stage three non-Hodgkin's lymphoma.