Family
- father Kent Damon: Born c. 1943; divorced from Damon's mother c. 1973
- mother Nancy Carlsson-Paige: Divorced from Damon's father c. 1973
- brother Kyle Damon: Born c. 1967
- daughter Isabella Damon: Born June 11, 2006; mother is Luciana Bozan
- daughter Gia Zavala Damon: Born Aug. 20, 2008; mother is Luciana Bozan
Companions
- Companion Winona Ryder: Introduced by Gwyneth Paltrow at a New Year's Eve party on Dec. 31, 1997; began relationship in 1998; split in April 2000
- Companion Minnie Driver: Met in 1997 while filming "Good Will Hunting" (1997); no longer together
- Companion Claire Danes: Briefly dated during the filming of "The Rainmaker" in 1997
- Companion Odessa Whitmire: Met when she was working as a personal assistant to Billy Bob Thornton and Ben Affleck; began dating in 2001; split in October 2003
- Claire Danes: dated during filming of "The Rainmaker"
- Kara Sands: no longer together
- Minnie Driver: met during filming of "Good Will Hunting"; dated in 1997
- Odessa Whitmire: reportedly dating as of 2001; worked as a personal assistant to Billy Bob Thornton and Ben Affleck; rumored to be engaged as of December 2002
- Skylar Statenstein: reportedly the model for Minnie Driver's character in "Good Will Hunting"; later married rock musician Lars Ulrich; born c. 1961
- Winona Ryder: introduced by Gwyneth Paltrow at a New Year's Eve party on December 31, 1997; began relationship in 1998; separated in April 2000
- Companion Skylar Statenstein: Born c. 1961; her relationship with Damon was the basis for the "Good Will Hunting" (1997) character Skylar, played by Minnie Driver; later married rock musician Lars Ulrich of Metallica
- wife Luciana Bozan: Argentine-born; previously went by the name Luciana Barroso; began dating in 2003 when they met in Miami Beach while Damon was filming the comedy "Stuck on You"; has a daughter, Alexia, from a previous relationship; married Dec. 9, 2005 in a private ceremony in New York City
