| 142nd Pennsylvania Volunteer Infantry | |
|---|---|
 Pennsylvania flag | |
| Active | August 1862 to May 29, 1865 |
| Country | United States |
| Allegiance | Union |
| Branch | Infantry |
| Size | 935 |
| Engagements | Battle of Fredericksburg Battle of Gettysburg Battle of Five Forks Second Battle of Petersburg Battle of Five Forks Battle of Appomattox Court House |
| Commanders | |
| Colonel of the Regiment | Robert P. Cummins Horatio N. Warren |
| Notable commanders | Robert P. Cummins |
The 142nd Pennsylvania Volunteer Infantry was a volunteer infantry regiment that fought in the Union Army during the American Civil War. The regiment primarily served in the Army of the Potomac in the Eastern Theater and was heavily engaged in the first day of fighting at Gettysburg.