Family
- father Gerald Hathaway: Born c. 1954
- mother Kate McCauley: born c. 1954
- brother Michael Hathaway: Older; has worked has Hathaway's assistant
- brother Thomas Hathaway: Younger
Companions
- Companion Scott Sartiano: Co-owner of the trendy East Village restaurant Butter; dated in 2002; no longer together
- Companion Raffaello Follieri: Began dating in Spring 2004; rumored to have ended the four-year romance in June 2008, after months of controversy surrounding Follieri's business dealings
- Companion Adam Shulman: Reportedly dating as of October 2008
