| 80th New York Infantry Regiment | |
|---|---|
.svg) | |
| Active | April 23-May 11, 1861 (mustered in) to August 2, 1861 (three months' militia service), then September 20-October 20, 1861 (mustered in) to January 29, 1866 |
| Country |  United States |
| Allegiance | Union |
| Branch | Infantry |
| Nickname(s) | Ulster Guard |
| Engagements | Second Battle of Bull Run Battle of Chantilly Battle of South Mountain Battle of Antietam Battle of Fredericksburg Battle of Gettysburg Mine Run 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 |
| Insignia | |
| 3rd Division, I Corps |  |
| 1st Division, I Corps |  |
| New York U.S. Volunteer Infantry Regiments 1861-1865 | ||||
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The 80th New York Infantry Regiment, originally designated the 20th New York State Militia Regiment, "Ulster Guard", was an infantry regiment of the Union Army during the American Civil War.