Baron Sinclair of Cleeve, of Cleeve in the County of Somerset, is a title in the Peerage of the United Kingdom.^[1] It was created on 21 January 1957 for the businessman and public servant, Robert Sinclair. He notably served as President of the Imperial Tobacco Company and as Director-General of Army Requirements at the War Office from 1939 to 1942 and as Chief Executive at the Ministry of Production from 1943 to 1945. As of 2010^[update] the title is held by his grandson, the third Baron, who succeeded his father in 1985.

• Robert John Sinclair, 1st Baron Sinclair of Cleeve (1893–1979)
• John Robert Kilgour Sinclair, 2nd Baron Sinclair of Cleeve (1919–1985)
• John Lawrence Robert Sinclair, 3rd Baron Sinclair of Cleeve (b. 1953).

There is no heir to the title.^[2]

Coat of arms of Baron Sinclair of Cleeve

Crest In front of a saltire Argent a dove Proper beaked and legged Gules in the beak an olive branch also Proper. Escutcheon Or a cross engrailed Sable in the first quarter a sword erect Proper on a chief also Sable three martlets Gold Supporters Dexter, a griffin Sable; sinister, a unicorn Argent; each gorged with a Or white may leaved and flowered Proper. Motto Credo (I Believe) [3]

• Kidd, Charles, Williamson, David (editors). Debrett's Peerage and Baronetage (1990 edition). New York: St Martin's Press, 1990.
• Leigh Rayment's Peerage Pages ^{[self-published source] [better source needed]}