| Birth Date: | September 23, 1879 |
| Birth Place: | Columbia, Virginia, U.S. |
| Term Start1: | January 8, 1930 |
| Term End1: | January 13, 1932 |
| Predecessor1: | George A. Bowles |
| Successor1: | Malcolm W. Perkins |
| Party: | Democratic |
| Spouse: | Eliza Cowherd |
Dabney Cosby (September 23, 1879 – May 15, 1956) was an American Democratic politician who served as a member of the Virginia House of Delegates, representing Goochland and his native Fluvanna County.[1]