Mahony may refer to :
- Bertha Mahony (1882–1969), children’s literature publisher
- Chris Mahony (born 1981) New Zealand rugby union player
- Dennis Mahony (1821–1879), Irish-Aamerican journalist and politician
- Eoghan Mahony, American television writer and producer
- Francis Sylvester Mahony (1804–1866), also known as Father Prout, Irish humorist
- Frank P. Mahony (1862–1916), Australian artist and member of the Dawn and Dusk Club
- Harold Mahony (1867–1905), Irish tennis player
- Jerry Mahony (born 1956), British auto racing driver
- John Keefer Mahony (1911-1990), Canadian recipient of the Victoria Cross
- Junior Mahony, Irish hurler
- Leo Halpin Mahony (born 1931), American architect
- Louise Mahony, Irish camogie player
- Marion Mahony Griffin (1871–1961), American architect and artist
- Pauric Mahony (born 1992), Irish hurler
- Philip Mahony (politician) (1897–1972), Irish politician
- Philip Mahony (hurler) (born 1991), Irish hurler
- Roger Mahony (born 1936), American cardinal of the Roman Catholic Church
- Tom Mahony, Irish hurler
- William Mahony (Australian politician) (1877–1962)
- William Mahony (Bishop) (1919-1994), Irish Bishop active in Africa
- William Mahony (swimmer) (born 1949), Canadian swimmer