John Brenan (died 1693) was a Roman Catholic prelate who served as Archbishop of Cashel (1677–1693) and Bishop of Waterford and Lismore (1671–1677).
[1][2][3] On 19 August 1671, John Brenan was appointed during the papacy of Pope Clement X as Bishop of Waterford and Lismore.
[1][2] On 6 September 1671, he was consecrated bishop by Francesco Maria Brancaccio, Cardinal-Bishop of Porto e Santa Rufina, with Stefano Brancaccio, Bishop of Viterbo e Tuscania, and Federico Baldeschi Colonna, Titular Archbishop of Caesarea in Cappadocia, serving as co-consecrators.
[2] On 8 March 1677, he was appointed during the papacy of Pope Innocent XI as Archbishop of Cashel.
[1][2] He served as Archbishop of Cashel until his death in 1693.