John Lonergan | |
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| Born | April 7, 1839 Carrick-on-Suir, Ireland |
| Died | August 6, 1902 (aged 66) Montreal, Quebec, Canada |
| Allegiance | United States of America Union |
| Service | United States Army Union Army |
| Years of service | 1862 - 1863, 1865 |
| Rank | Captain |
| Unit |  Company A, 13th Vermont Infantry |
| Battles / wars | 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.