The Bishop of Tuam, Killala and Achonry was the Church of Ireland Ordinary of the former Diocese of Tuam, Killala and Achonry in the Province of Armagh. The last Bishop of Tuam, Killala and Achonry was the Right Reverend Patrick Rooke.
The bishop had two episcopal seats (Cathedra): St. Mary's Cathedral, Tuam and St Patrick's Cathedral, Killala. There had been a third, St. Crumnathy’s Cathedral, Achonry, but it was deconsecrated in 1998 and subsequently used for ecumenical events.
Following the retirement in January 2011 of the Right Reverend Richard Henderson, it was proposed that no successor be elected immediately, so as to give a committee time to consider the future of the diocese; this proposal was, however, defeated on 5 March 2011 at a special meeting of the Church of Ireland General Synod called to consider the suggestion. A successor, Patrick Rooke, was accordingly elected. Rooke, who was the last bishop of the Diocese of Tuam, Killala and Achonry, retired in October 2021. The diocese was subsequently amalgamated with the Diocese of Tuam, Limerick and Killaloe.