| 31st Wisconsin Infantry Regiment | |
|---|---|
 | |
| Active | December 24, 1862 – July 8, 1865 |
| Country | United States |
| Allegiance | Union |
| Branch | Infantry |
| Size | Regiment |
| Engagements | American Civil War |
| Commanders | |
| Colonel | Isaac E. Messmore |
| Colonel | Francis H. West |
The 31st Wisconsin Infantry Regiment was a volunteer infantry regiment that served in the Union Army during the American Civil War.