Peter Brennan may refer to:
Peter Brennan (bobsleigh) (born 1942), American Olympic bobsledder Peter Brennan (producer), American television producer Peter J. Brennan (1918–1996), United States Secretary of Labor under Presidents Nixon and Ford Peter Brennan (Newfoundland politician) (1786–1887), Irish-born political figure in Newfoundland Peter Paul Brennan (1941–2016), bishop of the Ecumenical Catholic Diocese of the Americas Pete Brennan (1936–2012), American basketball player Peter M. Brennan, American diplomat