CW: One Tree Hill
- Official network site. Show overview, cast, character, and episode guides, interviews, images, and video clips.
- http://www.cwtv.com/shows/one-tree-hill

Yahoo! Groups: One Tree Hill
- Show, cast, character and episode discussions. [Yahoo! registration required.]
- http://tv.groups.yahoo.com/group/one-tree-hill/

One Tree Hill Online
- Includes news, episode guide, cast biographies, image gallery, spoilers, and a forum.
- http://www.onetreehillonline.com/

One Tree Hill News
- News and trivia.
- http://www.onetreehillnews.info/

One Tree Hill Fans
- News, forum, interviews, location maps, and mailing list.
- http://www.onetreehillfans.com/

PunkNDisorderly
- Official site of the character Peyton Sawer. Weblog, artwork, and video.
- http://www.punkndisorderly.com/

Tree Hill High
- Official site. Cast images, icons, and printable book covers.
- http://www.treehillhigh.com/

Ravens Hoops
- Official site of the character Mouth McFarland, focuses on the basketball team. Video clips and mailing list.
- http://www.ravenshoops.com/

IMDb: One Tree Hill
- Cast, crew, and production information.
- http://imdb.com/title/tt0368530/