American Canadian Underwater Certifications, Inc.
- Based in Canada, with worldwide operations. Lists ACUC dive centers, information about training programs, and provides some online services for Canadiand and USA members.
- http://www.acuc.es/

British Octopush Association
- The Controlling Body of Underwater Hockey in the United Kingdom.
- http://www.reedconsulting.com/britishoctopush/

Underwater Explorers Club of Western Australia
- Features mission statement, contacts, photo album, and newsletter. Headquarters in Perth.
- http://www.uecwa.com.au/

San Marcos Area Recovery Team
- SMART Divers was organized to assist public service agencies and organizations with underwater search, recovery, and crime scene investigations.
- http://www.smartdivers.com

Australian Diver Accreditation Scheme (ADAS)
- A Commonwealth Government not-for-profit diver training and accreditation scheme, for occupational divers.
- http://www.adas.org.au

US Dental Diving Association
- An organization of dentists who enjoy the activity. Features information on the group, newsletter, photos and contacts.
- http://www.usdda.com

Association of Tobago Dive Operators
- Directory of operators, hotels, magazines and allied members, with information on local recompression chamber.
- http://www.tobagoscubadiving.com/

Dizzy Divers
- Fundraising charity for disabled diving training. Includes on-line store, members, sponsors, and humor.
- http://www.dizzydivers.org/

Blueventures Conservation
- UK-based not-for-profit organization, dedicated to facilitating projects that enhance global coral reef conservation and research, offering opportunities to volunteers. Includes news, expeditions, and contact information.
- http://www.blueventures.org

Oceanic Research Group
- A non-profit environmental organization dedicated to ocean conservation with large stock photo archive.
- http://www.oceanicresearch.org/

Midwest Technical Recovery Team
- Dive team which provides assistance in the recovery of persons or evidence in the Great Lakes region especially in environments beyond recreational diving limits. Includes description of training, FAQ, and photographs.
- http://www.mtrt.org/

Cayman Islands Watersports Operators Association
- Promotes safety and cooperation among local dive operators. Includes Code of Safety Requirement and Standards.
- http://www.cayman.org/ciwoa/

Divers Recall
- US centric, organization for deep sea divers, commercial and military, retired and active.
- http://diversrecall.org

UK Sport Diving Medical Committee
- Advises three UK diving organizations - BSAC, SAA and SSAC on medical issues including fitness to dive. Includes medical standards, referees, research reviews, and contact information.
- http://www.uksdmc.co.uk

NAUI Services Canada - Divemar Inc.
- Official distributor for NAUI products and services in Canada including non-leadership certifications.
- http://divemar.com/naui.html

International Association of Dive Rescue Specialists
- A non-profit organization for rescue and recovery divers. Features membership and conference information, mission statement, contacts, news and photos.
- http://www.iadrs.org

Bahamas Diving Association
- Offers a complete scuba diving guide to The Islands of The Bahamas.
- http://www.bahamasdiving.com

Cave Divers Association of Australia
- Official website of the CDAA. Information on training, dive sites, site maps, news, instructors, products and photographs.
- http://www.cavedivers.com.au

The Historical Diving Society
- The HDS aims to protect and preserve diving heritage. Everything about historical divers, diving history, underwater technology, inventions and submarine engineering.
- http://www.thehds.com/

American Academy of Underwater Sciences
- A non-Profit group composed of diving scientists who are dedicated to the establishment and maintenance of standards for scientific diving.
- http://www.aaus.org

DAN Divers Alert Network
- A non-profit scuba diving and dive safety association providing expert medical advice for underwater injuries, emergency information, research, and products.
- http://www.diversalertnetwork.org

DEMA - Diving Equipment & Marketing Association
- Represents companies whose mission is to promote and help provide growth within recreational diving. Includes news, calendar of events, and information on membership.
- http://www.dema.org

USOA - Underwater Society of America
- The sanctioning body for underwater sports in the United States, is active in issues affecting divers right to dive, marine ecology, safety, legislation, conservation and serves to provide education and information that keep divers, councils, and clubs aw
- http://www.underwater-society.org/