| William Cox | |
| Office: | Member of Parliament for Derby |
| Term Start: | 11 July 1865 |
| Term End: | 17 November 1868 |
| Alongside: | Michael Thomas Bass |
| Predecessor: | Samuel Beale |
| Successor: | Samuel Plimsoll |
| Birth Date: | 1808 |
| Death Date: | 18 March 1877 |
| Nationality: | British |
| Party: | Conservative |
William Thomas Cox (1809 - 18 March 1877) was a Conservative Party politician. Cox was elected Conservative MP for Derby in 1865 and held his seat until the election in 1868 in which he was defeated. Later, Cox attempted to regain his seat in 1874, but failed.[1] [2]