| John Galligan | |
| Position: | Outfielder |
| Birth Place: | Easton, Pennsylvania, U.S. |
| Death Place: | Bronx, New York, U.S. |
| Bats: | Unknown |
| Throws: | Unknown |
| Debutleague: | MLB |
| Debutdate: | September 2 |
| Debutyear: | 1889 |
| Debutteam: | Louisville Colonels |
| Finalleague: | MLB |
| Finaldate: | October 14 |
| Finalyear: | 1889 |
| Finalteam: | Louisville Colonels |
| Statleague: | MLB |
| Stat1label: | At bats |
| Stat1value: | 120 |
| Stat2label: | RBI |
| Stat2value: | 7 |
| Stat3label: | Home runs |
| Stat3value: | 0 |
| Stat4label: | Batting average |
| Stat4value: | .167 |
John T. Galligan (June 1865 – August 22, 1937) was an American professional baseball player who played for the 1889 Louisville Colonels.