| Birthname: | William Alonzo Rinehart |
| Birth Date: | April 5, 1846 |
| Birth Place: | Fincastle, Virginia, U.S. |
| Death Place: | Covington, Virginia, U.S. |
| State Senate: | Virginia |
| District: | 7th |
| Term Start: | January 10, 1912 |
| Term End: | January 14, 1920 |
| Preceded: | Floyd W. King |
| Succeeded: | George W. Layman |
| Office2: | Member of the Virginia House of Delegates for Alleghany, Bath, and Highland |
| Term Start2: | December 4, 1895 |
| Term End2: | December 1, 1897 |
| Predecessor2: | Archibald F. Withrow |
| Successor2: | Archibald F. Withrow |
| Party: | Democratic |
| Spouse: | Mary Lewis Lipes |
| Branch: | Confederate States Army |
| Serviceyears: | 1862–1865 |
| Rank: | Private |
| Unit: | 2nd Virginia Cavalry |
| Battles: | American Civil War |
William Alonzo Rinehart (April 5, 1846 – January 30, 1922) was an American Democratic politician who served as a member of the Virginia Senate, representing the state's 7th district.[1] [2]