American Society for the Preservation of the Neapolitan Mastiff
- Dedicated in the promotion, and preservation of the breed. Historical pictures, breed history and standard, organization information, membership application, news, and a calendar of events.
- http://www.aspnm.org/

The Neapolitan Mastiff Club United Kingdom
- History and standard of the breed, code of ethics, show schedules and news, rescue contacts, and tips for new owners.
- http://www.theneapolitanmastiffclubuk.com/

Neapolitan Mastiff Club of Canada
- News, their code of ethics, discussion forum, and how to join.
- http://www.nmcc.ca/

Mastino Napoletano Club of New Ssouth Wales
- Features information on shows in Australia, and information on health, breeders, items for sale, and club membership.
- http://www.mastinoau.com/

Garden State Neapolitan Mastiff Club
- New Jersey club offers membership and show information, photographs, forums, and news.
- http://www.gsnmc.com/

United States Neapolitan Mastiff Club
- Breed and club information, updates on shows and events, news, and health articles.
- http://www.neapolitan.org/