Peter Brennan
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