Diagnosis: Fan
- Cast and character bios, quizzes, trivia, and gallery.
- http://www.freewebs.com/diagnosis_fan/

TV.com: Diagnosis Murder
- Episode guide, cast and crew information.
- http://www.tv.com/diagnosis-murder/show/187/summary.html

DiAl Dm FoR DiAgNoSis MuRdEr
- Pictures, cast information, and reviews of books based on the series.
- http://charliesondm.tripod.com/index.html

Martha & Abbie's World
- Character and episode guides for seasons 3-8.
- http://www.dmsisters.50g.com/epi.htm

IMDb: "Diagnosis Murder" (1993)
- Cast, crew, and production information.
- http://www.imdb.com/title/tt0105986/

Diagnosis Murder.co.uk
- Episode guides, fan fiction, images, cast information, and message board.
- http://www.diagnosismurder.co.uk/

Diagnosis Murder Fanfiction Challenge
- Stories, challenges, list of beta readers, and submission information.
- http://diagnosismurder.8k.com/