Mullen is a surname of Irish origin. According to historian C. Thomas Cairney, the O'Mullens were a chiefly family of the Uí Mháine tribe who in turn were from the Dumnonii or Laigin who were the third wave of Celts to settle in Ireland during the first century BC.
Notable people with the surname include:
Alex Mullen (disambiguation)
Andrew Mullen (born 1996), British Paralympian swimmer
Ann A. Mullen (1935–1994), American politician
April Mullen, Canadian actress and filmmaker
Barbara Mullen (1914–1979), American actress
Brian Mullen (born 1962), former NHL player
Charlie Mullen (1889–1963), Major League Baseball first baseman
Conor Mullen (born 1962), Irish actor
Dan Mullen (born 1972), American college football coach
Danny Mullen (born 1995), Scottish professional footballer
David Mullen (singer) (born 1964), former Blues Pop/CCM singer and producer
David Robert Mullen (born 1952), American artist and photographer
Earl Mullen (1902–1969), American politician and businessman
Ed Mullen (1913–1988), American professional basketball player
Frank Mullen (born 1970), American death metal vocalist
Fraser Mullen (born 1993), professional footballer
Geoff Mullen (1947–2014), Australian draft resister
George Mullen, astronomer
Graham Calder Mullen (born 1940), Senior United States District Judge
Harryette Mullen (born 1953), American poet, author and professor of English
Jack Mullen (1922–2004), American politician from Nebraska
James T. Mullen (1843–1891), first Supreme Knight of the Knights of Columbus
Jarrod Mullen (born 1987), Australian former rugby league footballer
Jeff Mullen (born c. 1968), college assistant football coach
Jerry Mullen (1933–1979), college basketball player
Jesse James Mullen (born c. 1984), American businessman and politician
Jim Mullen (born 1945), Scottish jazz guitarist
Jimmy Mullen (footballer born 1923) (1923–1987), football player
Jimmy Mullen (footballer born 1952) (born 1952), former football player and manager
Joe Mullen (born 1957), former National Hockey League player
John Mullan (disambiguation)
Karl Mullen (1926–2009), Irish rugby union player
Kathryn Mullen (born 1940), American puppeteer, actress, and voice actress
Keith Mullen (born 1961), English rock musician
Larry Mullen, Jr., (born 1961), drummer for U2
Laura Mullen (born 1958), American poet
Luke Mullen (born 2001), American actor, filmmaker, and environmentalist
M. David Mullen (born 1962), Japanese-born American cinematographer
Marie Mullen (born 1953), Irish actress
Mark Mullen (born 1961), NBC news chief and reporter
Matthew Mullen (born 1989), Australian footballer
Michael Mullen (disambiguation)
Moon Mullen (1917–2013), American baseball player
Nick Mullen (born 1988), American comedian
Nicole C. Mullen (born 1967), American singer, songwriter, and choreographer
Patrick Mullen (ice hockey) (born 1986), American ice hockey player
Patrick Mullen (Medal of Honor) (1844–1897), member of the United States Navy
Paul Mullen (musician) (born 1982), English multi-instrumentalist and singer-songwriter
Paul Mullen (rugby union) (born 1991), Irish-born rugby union player
Peg Mullen (1917–2009), American anti-war activist
Peter Mullen (born 1942), British Church of England priest and rector
Rodney Mullen (born 1966), professional skateboarder
Rónán Mullen (born 1970), Irish politician
Ruth González Mullen (1939–2009), Cuban artist
Ryan Mullen (born 1994), Irish professional racing cyclist
Samuel Mullen (1828–1890), Irish bookseller in Australia
Sheila Mullen (artist) (born 1942), Scottish painter
Sheila Mullen (model) (born 1957), American model
Thomas Mullen (1897–1966), Irish Fianna Fáil politician and school teacher
Tiawan Mullen (born 2000), American football player
Tobias Mullen (1818–1900), Roman Catholic Bishop of Erie
Tom Mullen (American football) (born 1951), American football player
Tom Mullen (Australian footballer) (1868–1942), Australian rules footballer
Trayvon Mullen (born 1997), American football player
William F. Mullen III (1964–2024), United States Marine Corps officer