Eadie's House
- Group of individuals dedicated to the prevention of small mammal cruelty and abuse. Information on their activism, photographs of rats for adoption, contact information for rescuing retired lab rats, and links to other rat rescues.
- http://www.eadieshouse.org/

RMCA
- Rat and Mouse Club of America. Includes club information, events, contests, merchandise, rat standards, vet recommendations, and magazine subscription information.
- http://www.rmca.org/

Bay Area Rat and Mouse Club of America
- Local chapter in California. Includes a list of local shelters.
- http://www.rmca.org/barmca/

Rat and Mouse Club of America - Southern California Chapter
- Club information and links to resources, as well as Furry Friends Orphanage in Southern California.
- http://www.rmca-socal.org/

London & Southern Counties Mouse and Rat Club
- Founded in 1916. Describes varieties of both animals and includes digital library, book list, and membership information.
- http://www.miceandrats.com/index.htm

American Fancy Rat and Mouse Association
- International rat and mouse club for show and pets.
- http://www.afrma.org/