William Sinclair | |
|---|---|
| Earl of Caithness | |
 Earl of Caithness Coat of Arms | |
| Predecessor | William Sinclair, Earl of Orkney and 1st Earl of Caithness |
| Successor | John Sinclair, 3rd Earl of Caithness |
| Born | c. 1459 |
| Died | 9 September 1513 |
| Noble family | Clan Sinclair |
| Father | William Sinclair, Earl of Orkney and 1st Earl of Caithness |
| Mother | Marjory Sutherland |
William Sinclair (c. 1459 – 9 September 1513) was a Scottish nobleman, the 2nd Earl of Caithness and chief of the Clan Sinclair, a Scottish clan of the Scottish Highlands.