| John Gallagher | |
| Nationality: | American |
| Sport: | Long-distance running |
| Event: | Marathon |
| Birth Date: | 13 April 1890 |
| Birth Place: | Philadelphia, Pennsylvania, United States |
John J. Gallagher (April 13, 1890 - May 13, 1950) was an American long-distance runner.[1] He competed in the marathon at the 1912 Summer Olympics.[2]
He later attended Georgetown University, becoming captain of its track team. He left school, and became physical director for the Chester Shipbuilding Company in Chester, Pennsylvania in April 1918.[3]