Family
- brother Ben Cook: born c. 1982
Companions
- Companion Colin Hanks: rumored to be dating as of October 2002
- Companion Daniel Gillies: engaged December 2003
- Brandon Davis: son of former Paramount executive Martin Davis; claim to be "just friends"
- Colin Hnaks: rumored to be dating as of October 2002
- Ryan Alosio: born c. 1973; starred opposite Cook in "The Hi-Line"; no longer together
- Shane West: dated briefly in 1998
- Vincent Kartheiser: dated briefly
