15th Illinois Infantry Regiment
| 15th Regiment Illinois Volunteer Infantry | |
|---|---|
Illinois flag | |
| Active | April 25, 1861, to September 16, 1865 |
| Country | United States |
| Allegiance | Union |
| Branch | United States Army Union Army |
| Type | Infantry |
| Engagements | American Civil War |
The 15th Illinois Infantry Regimenty was an infantry regiment that served in the Union Army during the American Civil War.