| 33rd Ohio Infantry Regiment | |
|---|---|
 Ohio state flag | |
| Active | August 5, 1861 – July 12, 1865 |
| Country | United States |
| Allegiance | Union |
| Branch | Infantry |
| Engagements | Battle of Perryville Battle of Stones River Tullahoma Campaign Battle of Chickamauga Siege of Chattanooga Battle of Lookout Mountain Battle of Missionary Ridge Atlanta Campaign Battle of Resaca Battle of Kennesaw Mountain Battle of Peachtree Creek Siege of Atlanta Battle of Jonesboro Sherman's March to the Sea Carolinas Campaign Battle of Bentonville |
| Insignia | |
| 1st Brigade, 1st Division XIV Corps, Army of the Cumberland/Army of the Ohio |  |
The 33rd Ohio Infantry Regiment was an infantry regiment in the Union Army during the American Civil War.