| John O'Neill | |
| Position: | Catcher |
| Bats: | Unknown |
| Throws: | Right |
| Birth Place: | New York City |
| Debutleague: | MLB |
| Debutdate: | September 6 |
| Debutteam: | New York Giants |
| Finalleague: | MLB |
| Finaldate: | September 5 |
| Finalteam: | New York Giants |
| Statleague: | MLB |
| Stat1label: | Games played |
| Stat1value: | 4 |
| Stat2label: | At bats |
| Stat2value: | 15 |
| Stat3label: | hits |
| Stat3value: | 0 |
| Teams: |
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John J. O'Neill was a Major League player. He was born in New York City.
Little is known about this utility who played for the New York Giants in parts of two seasons. Used as a backup catcher for John Warner and Frank Bowerman, O'Neill appeared in four games and went hitless in 15 at-bats (.000). As a catcher, he collected 19 outs with eight assists and committed four errors for a .931 fielding percentage.