John Brennan

John Brennan may refer to:

Public officials

• Jack Brennan (1937–2023), U.S. Marine officer and aide of Richard Nixon
• John O. Brennan (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 (1887–1943), 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) (c. 1836–1889), first American Catholic priest to declare bankruptcy
• John W. Brennan (born c. 1968), United States Army general

See also

• John Brenan (disambiguation)
• John O'Brennan, Irish political scientist