Hardy Detective Agency
- Fan site with information about the books and Hardy Boys fan fiction.
- http://www.hardydetectiveagency.com

Gary's Hardy Boys Books
- Includes biography of Franklin W. Dixon, canon overview, message board, and a list of collected editions.
- http://www.win.net/~bayport/booklist.html

Stratemeyer Syndicate: The Hardy Boys
- Article discussing Edward Stratemeyer, his publishing syndicate, and the origins and development of the series. Includes cover art, adaptations in other media, and appraisals information.
- http://www.keeline.com/Stratemeyer.html

Who Wrote the Hardy Boys?
- Discusses the individuals who outlined, wrote, edited, and revised each book in the series under the collective pen name of Franklin W. Dixon. [PDF Format]
- http://www.keeline.com/Hardy_Boys.pdf

SkyWarp's Hardy Boys Casefiles
- Focuses on the Casefiles series. Includes cover scans, character appearances, locations guide, organization profiles, forums, book summaries, wallpaper, and site updates.
- http://www.hardyboyscasefiles.com/