List of Famous people with last name Caithness

William Sinclair (1410–1480), 1st Earl of Caithness (1455–1476), last Earl (Jarl) of Orkney, 1st Lord Sinclair and 11th Baron of Roslin was a Norwegian and Scottish nobleman and the builder of Rosslyn Chapel, in Midlothian.

George Sinclair was a Scottish nobleman, the 4th Earl of Caithness and chief of the Clan Sinclair, a Scottish clan of the Scottish Highlands.

Brigadier James Roderick Sinclair, 19th Earl of Caithness, CBE, DSO was a British Army officer during World War II and was also chief of Clan Sinclair.

John Sinclair, Master of Caithness was a Scottish nobleman and chief of the Clan Sinclair, a Scottish clan of the Scottish Highlands.

John Sinclair was a Scottish nobleman, 8th Earl of Caithness and chief of the Clan Sinclair, a Scottish clan of the Scottish Highlands.

James Sinclair, 14th Earl of Caithness,, styled Lord Berriedale from 1823 to 1855, was a Scottish Liberal politician, scientist and inventor.

John Sinclair was a Scottish nobleman, 3rd Earl of Caithness and chief of the Clan Sinclair, a Scottish clan of the Scottish Highlands.