Family
- father Paul Heigl: Born c. 1941; divorced from Heigl's mother in 1996
- mother Nancy Heigl: Born c. 1953; divorced from Heigl's father in 1996; manages daughter's career
- brother John Heigl: Older
- sister Meg Heigl: Older
- brother Jason Heigl: Older; died in 1986 of brain injuries suffered in a car accident, after being thrown from the back of a pickup truck
- brother Holt Heigl: Older
- daughter Naleigh Kelley: Adopted a special needs baby from Korea with husband Josh Kelley; born November 2008 and was adopted in September 2009
Companions
- Jason Behr: met when they co-starred on "Roswell"; reportedly dating in 2001
- Joey Lawrence: dated for three months in 1994
- husband Josh Kelley: Met spring 2005, when Heigl was cast in Kelley's music video for "Only You"; engaged June 2006; married December 23, 2007 in Park City, Utah
