| Birthname: | William Gilliam |
| Birth Date: | c. 1841 |
| Death Place: | New York, New York, U.S. |
| Office: | Member of the Virginia House of Delegates from Prince George County |
| Term Start: | December 6, 1871 |
| Term End: | December 1, 1875 |
| Predecessor: | A. N. Fretz |
| Successor: | Mann Page |
| Party: | Republican |
William Gilliam (c. 1841 – January 23, 1893) was an American Republican politician who served as a member of the Virginia House of Delegates, representing Prince George County from 1871 to 1875. He was one of the first African-Americans to serve in Virginia's government.[1]