Brigadier James Roderick Sinclair, 19th Earl of Caithness, CBE, DSO (29 September 1906 – 8 May 1965) was a British Army officer during World War II and was also chief of Clan Sinclair. Sinclair joined the Gordon Highlanders and rose to the rank of Brigadier and as such led his regiment (part of the 51st (Highland) Division) through France, Belgium, the Netherlands into Germany during World War II and was decorated with the Distinguished Service Order and made Commander of the Order of the British Empire. Sinclair succeeded his sonless paternal uncle as 19th Earl of Caithness.