| John Fitzgerald | |
| Position: | Pitcher |
| Bats: | Unknown |
| Throws: | Unknown |
| Birth Place: | Waterbury, Connecticut |
| Birth Date: | 1866 |
| Death Place: | Waterbury, Connecticut |
| Debutleague: | MLB |
| Debutdate: | April 18 |
| Debutyear: | 1890 |
| Debutteam: | Rochester Broncos |
| Finalleague: | MLB |
| Finaldate: | July 13 |
| Finalyear: | 1890 |
| Finalteam: | Rochester Broncos |
| Statleague: | MLB |
| Stat1label: | Win–loss record |
| Stat1value: | 3 - 8 |
| Stat2label: | Earned run average |
| Stat2value: | 4.04 |
| Stat3label: | Innings pitched |
| Stat3value: | 78 |
| Teams: | |
John J. Fitzgerald (1866 - December 20, 1892), also known as Warren B. Fitzgerald, was an American Major League Baseball player who pitched one season in the Majors with the 1890 Rochester Broncos. He pitched in a total of 11 games, started all of them, and completed eight. He struck out 35 batters in 78 innings pitched.[1]