| 21st Maine Infantry Regiment | |
|---|---|
| Active | October 14, 1862, to August 25, 1863 |
| Country | United States |
| Allegiance | Union |
| Branch | Infantry |
| Engagements | Siege of Port Hudson |
| Maine U.S. Volunteer Infantry Regiments 1861-1865 | ||||
|
The 21st Maine Infantry Regiment was an infantry regiment that served in the Union Army during the American Civil War.