John Brennan

John Brennan may refer to:

Public officials

 * Jack Brennan (born 1937), U.S. Marine officer and aide of Richard Nixon
 * John Brennan (CIA officer) (born 1955), former CIA Director
 * John P. Brennan (1864–1943), Democratic politician in the U.S. state of Ohio
 * John Brennan Hussey (born 1934), former mayor of Shreveport, Louisiana
 * John Joseph Brennan (1913–1976), Northern Ireland politician
 * John Brennan (Irish senator) (1901–1977), Fianna Fáil politician
 * John A. Brennan Jr. (born 1945), American lobbyist and Massachusetts politician

Sports

 * J. J. Brennan (died 1944), Irish hurler
 * John Brennan (Derry Gaelic footballer) (born 1942), Gaelic football manager and player
 * John Brennan (Kerry Gaelic footballer), former Gaelic footballer
 * Jack Brennan (footballer, born 1892) (1892–1942), English footballer for Bradford City and Manchester City
 * John Brennan (American football) (1913–1982), American football player
 * Jack Brennan (baseball) (1862–1914), American baseball catcher
 * John Brennan (athlete) (1879–1964), American track and field athlete

Artists

 * Johnny Brennan (born 1961), American actor, screenwriter and voice actor
 * John Wolf Brennan (born 1954), Irish pianist, organist and composer

Other people

 * John J. Brennan (businessman) (born 1954), chairman and CEO of The Vanguard Group
 * John Calder Brennan (1908–1996), U.S. historian
 * John Brennan (doctor) (c. 1768–1830), Irish doctor
 * Sidney Czira (1889–1974), Irish journalist and revolutionary known by her pen name "John Brennan"
 * John N. H. Brennan (1914–2010), Irish author, huntsman and solicitor
 * John P. Brennan (priest), first American Catholic priest to declare bankruptcy
 * John W. Brennan, United States Army general