Sir John Trelawny, 4th Baronet (26 July 1691 – 2 February 1756), of Trelawne in Cornwall, was an English politician who sat in the House of Commons from 1713 to 1734.Trelawny was the eldest son of Sir Jonathan Trelawny, 3rd Baronet and his wife Rebecca Hele, daughter of Thomas Hele of Bascombe, Devon. His father was Bishop of Bristol, Bishop of Exeter and Bishop of Winchester. He matriculated at Christ Church, Oxford on 26 January 1708. He married Agnes Blackwood daughter of Thomas Blackwood of Scotland. He succeeded his father in the baronetcy on 19 July 1721.