John J. Cronin (May 26, 1874 – July 12, 1929) was a Major League Baseball (MLB) pitcher. He played professionally from 1895 through 1912. His MLB career included stints with the Brooklyn Grooms (1895), Pittsburgh Pirates (1898), Cincinnati Reds (1899), Detroit Tigers (1901–1902), Baltimore Orioles (1902), New York Giants (1902–1903), and Brooklyn Superbas (1904).