| Unit Name: | 3rd Michigan Infantry Regiment |
| Dates: | May 21, 1861, to June 10, 1864 |
| Country: | United States |
| Allegiance: | Union |
| Branch: | Infantry |
| Size: | 1,238 |
| Battles: | First Battle of Bull Run Peninsular Campaign Second Battle of Bull Run Battle of Chantilly Battle of Fredericksburg Battle of Chancellorsville Battle of Gettysburg Battle of the Wilderness Battle of Cold Harbor |
| Notable Commanders: | Colonel Daniel McConnell Colonel Stephen Gardner Champlin Colonel Byron Root Pierce |
The 3rd Michigan Infantry Regiment was an infantry regiment that served in the Union Army during the American Civil War.