John Sinclair | |
|---|---|
| Earl of Caithness | |
 Earl of Caithness Coat of Arms | |
| Predecessor | William Sinclair, 2nd Earl of Caithness |
| Successor | George Sinclair, 4th Earl of Caithness |
| Died | 1529 |
| Noble family | Clan Sinclair |
| Father | William Sinclair, 2nd Earl of Caithness |
| Mother | Margaret Keith |
John Sinclair (died 1529) was a Scottish nobleman, 3rd Earl of Caithness and chief of the Clan Sinclair, a Scottish clan of the Scottish Highlands.