Mullany is a surname. Notable people with the surname include:
- Charlie Mullany (1881–1937), Australian rules footballer
- James Robert Madison Mullany (1818–1887), US Navy rear admiral
- John Mullany, an Australian politician in the 1910s and 1920s
- Kate Mullany (1845–1906), early American female labor leader
- Mitch Mullany (1968–2008), American comedian, actor and screenwriter
- Patrick Mullany, former FBI instructor and agent who co-pioneered offender profiling
- Peter Mullany, a guitarist for Johnny Dole & The Scabs, one of the first Australian punk rock bands
- Antigua honeymoon murders of newlyweds Ben (1977–2008) and Catherine Mullany (1977–2008)
- Patrick Francis Mullany, known as Brother Azarias, Irish-American essayist