Malcolm Ian Sinclair, 20th Earl of Caithness, PC (born 3 November 1948), is a Scottish Conservative politician and member of the House of Lords as one of the remaining hereditary peers. He is also 20th Lord Berriedale, 15th Baronet, of Canisbay, Co. Caithness, and chief of Clan Sinclair. He is the Chief Executive of the Clan Sinclair Trust.