George Sinclair (died 1643) was a Scottish nobleman, the 5th Earl of Caithness and chief of the Clan Sinclair, a Scottish clan based in northern Scotland.
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Early life
George Sinclair, 5th Earl of Caithness was the eldest son of John Sinclair, Master of Caithness and his wife Jean, daughter of Patrick Hepburn, 3rd Earl of Bothwell. His father, the Master of Caithness, had obtained a charter from Mary, Queen of Scots by which the Earldom of Caithness became a ''male fee'', to him and his male heirs. According to Henderson, George Sinclair, 5th Earl of Caithness therefore succeeded his grandfather, George Sinclair, 4th Earl of Caithness in 1583. However, according to The Scots Peerage he succeeded his grandfather in 1582 and having then been a minor he was under the wardship of the Earl of Gowrie.