Sir John Turner, 3rd Baronet (1712–1780), of Warham, Norfolk, was a British lawyer and politician who sat in the House of Commons from 1739 to 1774. Turner was baptized on 19 June 1712, the only son of , of Warham and his wife Anne Allen, daughter of Thomas Allen, London merchant. He was educated at. Greenwich school and was admitted at Middle Temple on 20 February 1729 and Christ's College, Cambridge on 9 January 1730. In 1736 he was called to the bar. He succeeded his father to the baronetcy on 6 January 1739.