John Dennis (born 19 June 1931) is a retired Anglican bishop and former Bishop of St Edmundsbury and Ipswich. He is currently an honorary assistant bishop in the Diocese of Winchester. He has two sons, the younger of whom is actor and comedian Hugh Dennis.
Dennis was educated at Rutlish School, Merton (where his father taught biology) and St Catharine's College, Cambridge before studying for ordination at Cuddesdon College, Oxford.
After curacies in Armley and Kettering he was appointed vicar of the Isle of Dogs in 1962, transferring to Mill Hill in 1971. After appointment as a prebendary of St Paul’s Cathedral, London in 1977, he became the Bishop of Knaresborough in 1979 and then the Bishop of St Edmundsbury and Ipswich in 1986.