Alonzo Breitenstein (November 9, 1857 – June 19, 1932) was a National League pitcher. Breitenstein played for the Philadelphia Quakers in the 1883 season. In one career game, he had a 0–1 record with a 9.00 ERA. Breitenstein allowed nine runs on eight hits, in five innings pitched. He was removed from the game at relieved by Art Hagan after being hit by a pitch while batting. With what hand he batted and threw is unknown.

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