John Porter was an 18th-century Anglican bishop in Ireland. Porter was born in Cheshire and educated at Manchester Grammar School and Trinity College, Cambridge.He became Fellow of Trinity in 1774, in which year he was also ordained priest. He was Regius Professor of Hebrew at Cambridge from 1790 to 1795. He was nominated Bishop of Killala and Achonry on 6 May 1795 and consecrated on 7 June 1795 that year. He was translated to Clogher on 30 December 1797 and died in office on 27 July 1819. His son, Reverend John Grey Porter (1789–1871) married Margaret Lavinia Lindsey in 1816.