John Thaddeus Ostrowski (October 17, 1917 – November 13, 1992) was an American professional baseball player.

Listed at 5 feet 10+1⁄2 inches (1.791 m) tall and 170 pounds (77 kg), Ostrowski batted and threw right-handed.

Over his 216 MLB games played, Ostrowski was a .234 hitter (131-for-561) with 14 home runs and 74 RBI in 216 games, including 73 runs, 20 doubles, nine triples, seven stolen bases, and a .321 on-base percentage.

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