Sir John Trevelyan, 2nd Baronet (9 April 1670 – 25 September 1755) of Nettlecombe, Somerset was a British landowner and Tory politician who sat in the English and British House of Commons between 1695 and 1722. Trevelyan was the eldest surviving son of Sir George Trevelyan, 1st Baronet of Nettlecombe Court and his wife Margaret Willoughby, daughter of John Willoughby of Ley Hill, Honiton, Devon. A year old, in 1671, he succeeded to the baronetcy on the death of his father. He matriculated at Wadham College, Oxford in 1687.