| Birthname: | William Duval Cardwell |
| Order: | 39th |
| Office: | Speaker of the Virginia House of Delegates |
| Term Start: | January 10, 1906 |
| Term End: | January 8, 1908 |
| Predecessor: | John F. Ryan |
| Successor: | Richard E. Byrd |
| Office2: | Member of the Virginia House of Delegates from Hanover County |
| Term Start2: | December 6, 1899 |
| Term End2: | January 8, 1908 |
| Predecessor2: | Bickerton L. Winston |
| Successor2: | Rosewell Page |
| Birth Date: | 12 April 1868 |
| Death Place: | Seminole, Florida, U.S. |
| Party: | Democratic |
| Spouse: | Jane Price Gregory |
| Father: | Richard H. Cardwell |
| Alma Mater: | Randolph–Macon College University of Virginia |
William Duval Cardwell (April 12, 1868 – June 27, 1954) was a Virginia politician. He represented Hanover County in the Virginia House of Delegates, and served as that body's Speaker from 1906 until 1908.
He was the son of Richard H. Cardwell.