| Birthname: | Alexander St. Clair |
| Birth Date: | April 17, 1845 |
| Birth Place: | Tazewell, Virginia, U.S. |
| Death Place: | Tazewell, Virginia, U.S. |
| State Senate1: | Virginia |
| District1: | 3rd |
| Term Start1: | December 6, 1893 |
| Term End1: | December 4, 1901 |
| Preceded1: | Charles J. Gose |
| Succeeded1: | John N. Harman |
| Party: | Democratic |
| Alma Mater: | Roanoke College |
| Spouse: | Maria Jane Tiffany |
| Branch: | Confederate States Army |
| Serviceyears: | 1863–1865 |
| Unit: | 16th Virginia Cavalry |
| Battles: | American Civil War |
Alexander St. Clair (April 17, 1845 – October 21, 1921) was an American farmer, banker, and politician who served as a member of the Virginia Senate.[1] [2]
His home, the Alexander St. Clair House, is on the National Register of Historic Places.