| John Lonergan | |
| Birth Date: | 7 April 1839 |
| Birth Place: | Carrick-on-Suir, Ireland |
| Death Place: | Montreal, Quebec, Canada |
| Placeofburial Label: | Place of burial |
| Allegiance: | United States of America Union |
| Branch: | United States Army Union Army |
| Serviceyears: | 1862 - 1863, 1865 |
| Rank: | Captain |
| Unit: | Company A, 13th Vermont Infantry |
| Battles: | American Civil War |
| Awards: | Medal of Honor |
John Lonergan (April 7, 1839 - August 6, 1902) was a captain in the Union Army and a Medal of Honor recipient for his actions in the Battle of Gettysburg during the American Civil War.
Rank and organization: Captain, Company A, 13th Vermont Infantry. Place and date: At Gettysburg, Pa., July 2, 1863. Entered service at: Burlington, Vt. Birth: Ireland. Date of issue: October 28, 1893.
Citation:
Gallantry in the recapture of 4 guns and the capture of 2 additional guns from the enemy; also the capture of a number of prisoners.