John Patrick Gilligan (born John Peter Gilgen, October 18, 1885 – November 19, 1980) was an American Major League Baseball pitcher. Gilligan played for the St. Louis Browns in 1909 and 1910.
Jack Gilligan
| Given name: | John Patrick Gilligan |
| Nicknames: | None |
| Primary Pos: | Pitcher |
| Hght/Wght: | 6'0" / 190 lbs |
| Bats/Throws: | B / R |
| Born: | Oct 18, 1885 in Chicago, IL |
| Died: | Nov 19, 1980 in Modesto, CA (95 years old) |
| Debut: | Sep 16, 1909 |