Sir John Hely (died 7 April 1701) was an English-born Irish judge.
He was born in London, eldest son of James Hely and was called to the Bar in 1679. He made an advantageous marriage to Meliora Gorges, daughter of the prominent merchant Ferdinando Gorges of Eye Manor. Meliora's sister Barbara married Thomas Coningsby, Ist Earl Coningsby, and Hely's rise seems to have been due to the connection.[1] He was appointed Chief Baron of the Irish Exchequer in 1690 on the recommendation of Coningsby,one of the Lord Justices for Ireland. In 1695 he became Chief Justice of the Irish Common Pleas. Soon afterwards despite his relative youth his health failed; in 1701 although he felt well enough to travel on the spring assizes he fell ill at Ennis and died.