Mulligan is a surname originating from Ireland, coming from the Irish Ó Maolagáin literally meaning "grandson of the bald man".^{[citation needed]}

People with this surname include:

• Andy Mulligan (author), English writer
• Blackjack Mulligan, ring name of name of American professional wrestler Robert Windham (1942–2016)
• Brennan Lee Mulligan (born 1988), American comedian, writer, and performer
• Carey Mulligan, British actress
• Charles Mulligan, American sculptor
• Cynthia Mulligan, Canadian television personality
• David Mulligan, New Zealand footballer
• Declan Mulligan (1938-2021), Irish-born American rock musician
• Eddie Mulligan, American baseball player
• Gary Mulligan, Irish footballer
• Geoff Mulligan, American computer scientist
• Gerry Mulligan, American musician
• Hercules Mulligan, a spy for the patriot forces in the American Revolutionary War
• Colonel James A. Mulligan, American Civil War soldier
• James Hillary Mulligan, American judge, politician, and poet
• James Venture Mulligan, Australian bushman and prospector
• John Mulligan, new wave musician with Fashion (1978–84)
• John Mulligan (baseball), American baseball player for one game in 1884
• Kevin Mulligan, British philosopher
• Leith Mulligan, Australian sports journalist
• Marty Mulligan, Australian tennis player
• Mary Mulligan, Scottish politician
• Michael Mulligan, American military prosecutor
• Noel Mulligan, Australian rugby league footballer
• Richard Mulligan (1932–2000), American actor
• Richard Mulligan (footballer), New Zealand footballer
• Robert Mulligan, American film director
• Rosemary Mulligan, American politician
• Terry David Mulligan, Canadian actor
• Thom Michael Mulligan, American actor
• William Hughes Mulligan, American judge

• Buck Mulligan, a fictional character in James Joyce's novel Ulysses

• Mulligan (disambiguation)
• Ted Mullighan (1939–2011), an Australian judge