Bishop Brennan may refer to:
- Bishop Leonard Brennan, a fictional character in the TV series Father Ted; see List of Father Ted characters (Bishop Brennan)
- "Kicking Bishop Brennan Up the Arse", an episode of the TV series Father Ted
- Denis Brennan (born 1945), Irish Roman Catholic Bishop of Ferns from 2006 until 2021
- Joseph Vincent Brennan (born 1954), American Roman Catholic Bishop of Fresno since 2019
- Mark E. Brennan (born 1947), American Roman Catholic Bishop of Wheeling-Charleston since 2019
- Robert J. Brennan (born 1962), American Roman Catholic Bishop of Brooklyn since 2021
- Thomas Francis Brennan, appointed (Roman Catholic) Bishop of Dallas in 1891 and later Auxiliary Bishop of St. John's, Newfoundland
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