John Joseph O'Neill (10 January 1873 – 29 June 1935) was a catcher in Major League Baseball who played for the St. Louis Cardinals (1902–03), Chicago Cubs (1904–05) and Boston Beaneaters (1906).

Steve was a catcher and manager, Jim a shortstop, and Mike, who also was born in Ireland, was a pitcher and formed a brother battery with Jack for the St. Louis Cardinals.

O'Neill shared catching duties for the Cardinals, Cubs and Beaneaters in a modest span of five years.

His most productive season came in 1903, when he posted career-highs in batting average (.236), runs (23), hits (58), doubles (nine), runs batted in (21), stolen bases (11) and games played (75).

He also collected 185 hits with 24 doubles, five triples, and one home run in 945 at-bats.