| Jack Leary | |
| Position: | Infielder/Outfielder/Pitcher |
| Bats: | Unknown |
| Throws: | Left |
| Birth Date: | July 1857 |
| Birth Place: | New Haven, Connecticut, U.S. |
| Death Place: | New Haven, Connecticut, U.S. |
| Debutleague: | MLB |
| Debutdate: | August 21 |
| Debutyear: | 1880 |
| Debutteam: | Boston Red Caps |
| Finalleague: | MLB |
| Finaldate: | July 5 |
| Finalyear: | 1884 |
| Finalteam: | Chicago Browns |
| Statleague: | MLB |
| Stat1label: | Games played |
| Stat1value: | 129 |
| Stat2label: | Batting average |
| Stat2value: | .232 |
| Stat3label: | Runs |
| Stat3value: | 56 |
| Teams: | |
John J. Leary (July, 1857 - December 6, 1905[1]) was an American Major League Baseball player, who played for seven different teams during his five-year career.[1] Jack died at the age of 48 in his hometown of New Haven, Connecticut.