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).

Cronin began his professional career pitching in two games for the Hartford Bluebirds of the Connecticut State League in July 1895. He signed with the Brooklyn Grooms, appearing in two games before receiving his release in September.

In May 1896, Cronin pitched for Pottsville of the Class-B Pennsylvania State League, before joining the New York Metropolitans of the Class-A Atlantic League, where he pitched from June through July. He signed with the Bangor Millionaires of the Maine State League in 1897, and joined the Fall River Indians of the New England League in July 1897. He pitched for Fall River through July 8, 1898, when he was purchased by the Pittsburgh Pirates of the National League (NL).

Released from the Pirates, Cronin joined the Detroit Tigers, then in the Class-A Western League in 1899. On September 18, 1899, the Cincinnati Reds of the (NL) purchased Cronin from Detroit. In April 1900, they returned Cronin to Detroit, now a member of the American League.

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