Robert Brennan may refer to:

• Bobby Brennan (1925–2002), English professional footballer
• Bobby Brennan (born 1979), American soccer defender
• Robbie Brennan (1947–2016), Irish drummer and a former member of the band Grand Slam
• Robert E. Brennan (born 1944), American businessman
• Robert Brennan (priest) (born 1941), priest and social activist
• Robert Brennan (journalist) (1881–1964), Irish writer, diplomat and a founder of The Irish Press newspaper
• Robert J. Brennan (born 1962), American prelate of the Roman Catholic Church

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