John Fell (23 June 1625 – 10 July 1686) was an English churchman and influential academic. He served as Dean of Christ Church, Oxford, and later concomitantly as Bishop of Oxford.
Born at Longworth, Berkshire (now Oxfordshire), the eldest son of Samuel Fell, who would himself be installed as Dean of Christ Church in 1638, and his wife Margaret née Wylde, he received his early education at Lord Williams's School at Thame in Oxfordshire. In 1637 aged only 11 he became a student at Christ Church, and in 1640 because of his "known desert", he was specially allowed by the Archbishop of Canterbury, William Laud, to proceed to his degree of B.A. when wanting one term's residence. He obtained his M.A. in 1643 and took Holy Orders (deacon 1647, priest 1649).
During the Civil War he bore arms for King Charles I of England and held a commission as ensign. In 1648 he was deprived of his studentship by the parliamentary visitors, and during the next few years he resided chiefly at Oxford with his brother-in-law, Thomas Willis, at whose house opposite Merton College he and his friends Richard Allestree and John Dolben kept up the service of the Church of England throughout the Commonwealth.