John Ernest Llewelyn Mort, CBE (13 April 1915 – 30 July 1997) was an Anglican clergyman who served as Bishop of Northern Nigeria in the third quarter of the twentieth century. Mort was educated at Malvern, St Catharine's College, Cambridge and Westcott House, Cambridge; and ordained deacon in 1940 and priest in 1941. After a curacy in Dudley, Worcestershire, he was the Diocese of Worcester's youth organiser from 1944 to 1948. He was also private chaplain to William Wilson Cash, the Bishop of Worcester, from 1943 to 1952; and vicar of Bedwardine from 1948 to 1952.