Family
- father Hutton Gibson: Was a leading figure in the conservative Catholic splinter group, The Alliance for Catholic Traditions; won a workman's compensation suit against New York Central Railroad in 1968, after falling from a train and injuring his back; moved family to Sydney, Australia when Mel was twelve; appeared on the Art Fleming-hosted version of the game show "Jeopardy!" and retired undefeated after five shows
- mother Ann Gibson: Born c. 1921 in Ireland and died in December 1990
- siblings : Mel was the sixth of eleven children (five boys and five girls); parents adopted eleventh child in Australia
- brother Donal Gibson: Born in 1958; had minor roles in films starring his brother Mel, such as "Braveheart" (1995) and "Maverick" (1994)
- daughter Hannah Gibson: Born c. 1980; mother, Robyn Gibson; married Blues musician Kenny Wayne Shepherd in September 2006
- son Edward Gibson: Born c. 1982; twin of Christian; mother, Robyn Gibson
- son Christian Gibson: Born c. 1982; twin of Edward; mother, Robyn Gibson
- son William Gibson: Born c. 1984; mother, Robyn Gibson
- son Louis Gibson: Born c. 1987; mother, Robyn Gibson
- son Milo Gibson: Born c. 1990; mother, Robyn Gibson
- son Thomas Gibson: Born c. 1999; mother, Robyn Gibson
- grandmother Eva Mylott: Paternal grandmother
Companions
- Companion Oksana Grigorieva: Met in summer of 2008 when she was hired to compose a song for Gibson's film "Edge of Darkness" (2009); signed her to his record label, Icon Records; rumors that they were dating began to surface around the time his wife filed for divorce in April 2009
