James Sinclair, 12th Earl of Caithness

James Sinclair, 12th Earl of Caithness was a Scottish noble and chief of the Clan Sinclair.

James Sinclair was born at Barrogill Castle (Castle of Mey) on 31 May 1766. He was the son of Sir John Sinclair of Mey, Baronet who he succeeded in the baronetcy in 1774. He succeeded as 12th earl of Caithness in 1789, as nearest lawful male heir of William Sinclair, 2nd Earl of Caithness. His claim to the peerage was sustained by the House of Lords.

He was lord-lieutenant of the county of Caithness and lieutenant-colonel of the Ross-shire militia.

He married at Thurso Castle on 2 January 1784 Jane, second daughter of Alexander Campbell of Bareldine who was deputy governor of Fort George. They had the following children:

1. John Sinclair, Lord Berriedale who died in 1802 aged 14.
2. Alexander Sinclair, 13th Earl of Caithness.
3. Four other sons and three daughters.