The Bishop of Ferns and Leighlin was the Ordinary of Church of Ireland diocese of Ferns and Leighlin in the Province of Dublin. The diocese comprised all of counties Wexford and Carlow and part of counties Wicklow and Laois in Ireland.
The Episcopal see was a union of the bishoprics of Ferns and Leighlin which were united in 1597. Over two hundred and thirty-eight years, there were twenty-nine bishops of the united diocese. Under the Church Temporalities (Ireland) Act 1833 (3 & 4 Will. 4. c. 37), Ferns and Leighlin were combined with Ossory to form the united bishopric of Ossory, Ferns and Leighlin on 12 July 1835.