John Mahoney (1940–2018) was an English-American actor.
John Mahoney may also refer to: John Mahoney (footballer) (born 1946), Welsh international footballer John Christopher Mahoney (1882–1952), United States federal judge John Francis Mahoney (1884–1929), Canadian lawyer and political figure John Friend Mahoney (1889–1957), American physician John J. Mahoney, member of the Massachusetts House of Representatives since 2011 John Mahoney (Ohio politician) (1949–2011), member of the Ohio Senate John W. Mahoney (1926–2006), lawyer, judge and politician in Newfoundland, Canada J. Daniel Mahoney (1931–1996), judge of the United States Court of Appeals John Mahony (ethicist) (born 1931), Scottish Jesuit and moral theologian John C. Mahoney (mayor) (1881–1946), American mayor
See also John Mahony (1863–1943), Irish sportsman John Keefer Mahony (1911–1990), Canadian Victoria Cross recipient Jack Mahoney (disambiguation)