| William P. Thompson | |
| Birth Date: | 11 January 1844 |
| Placeofburial: | Greenbush Cemetery Lafayette, Indiana |
| Placeofburial Label: | Place of burial |
| Allegiance: |  United States of America |
| Serviceyears: | 1861–1864 |
| Rank: | Sergeant |
| Unit: | 20th Indiana Infantry Regiment |
| Battles: | Battle of the Wilderness |
| Awards: | Medal of Honor |
William P. Thompson (January 11, 1844 – October 7, 1864) was a sergeant in the American Civil War and a recipient of the Medal of Honor for action at Battle of the Wilderness during which he was killed on May 6, 1864[1] with an award being issued to him on December 1, 1864.[2] He was buried at Greenbush Cemetery, Lafayette, Indiana.[1]