| Harrison Stiles Fairchild | |
| Birth Date: | 4 August 1820 |
| Birth Place: | Cazenovia, New York, US |
| Death Place: | Rochester, New York, US |
| Placeofburial: | Mount Hope Cemetery Rochester, New York |
| Placeofburial Label: | Place of burial |
| Allegiance: | United States of America Union |
| Branch: | United States Army Union Army |
| Serviceyears: | 1861–1865 |
| Rank: | Colonel Bvt. brigadier general |
| Commands: | 89th New York Infantry |
| Battles: | American Civil War |
Harrison Stiles Fairchild (August 4, 1820 - January 25, 1901), was a colonel and brevet brigadier general in the Union Army during the American Civil War. He commanded a brigade in Charles A. Heckman's Second Division of the XVIII Corps at the Battle of Chaffin's Farm.