Family
- father Stephen Gyllenhaal:
- mother Naomi Foner:
- sister Maggie Gyllenhaal: born c. 1978; acted with brother in "Donnie Darko"
- godmother Jamie Lee Curtis:
Companions
- Companion Natalie Portman: rumored to have briefly dated in 2006
- Companion Reese Witherspoon: met while co-starring in the CIA thriller "Rendition"; reportedly dating since March 2007
- Jamie King: reportedly dated in spring 2001
- Kirsten Dunst: romantically linked in October 2002
