John Vivian (1750 – 7 December 1826) was a Welsh industrialist of Cornish extraction. Himself a descendant of the Vivians of Trewan, Cornwall, he was the first member of this branch of the family to settle in South Wales, where he became the ancestor of the Vivian baronets and barons. He was the son of Reverend Thomas Vivian (died 17 March 1793) and Mary Hussey (1 February 1719 – circa 24 December 1807), of Truro St. Mary, Cornwall, who had been married on 30 November 1747 at Kenwyn, Cornwall.