Michael J. Flynn (March 15, 1872 – June 16, 1941) was a Major League Baseball catcher, at least for one day, during the 1891 season. He was born in County Kildare, Ireland.

He played in one game for the Boston Reds of the American Association, on August 31, 1891. Behind the plate, he handled six chances flawlessly for a fielding percentage of 1.000. At the plate, he went 0-for-2 for a .000 batting average. The game with the Louisville Colonels ended in a 2-2 tie. It was played at the Congress Street Grounds in Boston, Massachusetts.

Flynn, a 19-year-old, was the sixth-youngest player to appear in an A.A. game that season.

• List of players from Ireland in Major League Baseball

• Career statistics and player information from Baseball Reference, or Baseball Reference (Minors)
• Retrosheet

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