Colonel Lord James Cavendish (born 1701 - died 1741) was a British soldier and politician, the third son of William Cavendish, 2nd Duke of Devonshire. On 1 November 1738, he was appointed colonel of the 34th Regiment of Foot. He led the regiment during the War of Jenkins' Ear, and was present at several engagements, including the investment of Cartagena and the attempt upon Cuba. He was returned in May 1741 as member for Malton, while in Jamaica between the two aforementioned engagements, but he died in November, presumably of tropical illness.