| 45th Pennsylvania Volunteer Infantry | |
|---|---|
 Pennsylvania flag | |
| Active | July 28, 1861 – July 17, 1865 |
| Country | United States of America |
| Allegiance | Union |
| Branch | Infantry |
| Engagements | Battle of Secessionville Battle of South Mountain Battle of Antietam Battle of Fredericksburg Siege of Vicksburg Siege of Jackson Knoxville Campaign Rapidan Campaign Battle of the Wilderness Battle of Spotsylvania Court House Battle of North Anna Battle of Totopotomoy Creek Battle of Cold Harbor Siege of Petersburg Battle of the Crater Battle of Globe Tavern Battle of Boydton Plank Road Battle of Fort Stedman Appomattox Campaign Third Battle of Petersburg |
| Insignia | |
| 1st Brigade, 1st Division, IX Corps (Union Army), Army of the Potomac/Army of the Ohio/Army of the Tennessee |  |
| 1st Brigade, 2nd Division, IX Corps (Union Army), Army of the Potomac |  |
| Pennsylvania U.S. Volunteer Infantry Regiments 1861-1865 | ||||
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The 45th Pennsylvania Volunteer Infantry was an infantry regiment that served in the Union Army during the American Civil War.