Diver organisations are membership based organisations where the membership is wholly, or at least in large part, underwater divers, and the organisation is intended to further a mutual interest related to underwater diving or the aquatic environment as it affects divers or diving activity. Some organisations have more than one focus of interest.

• AIDA International (AIDA) – Worldwide rule- and record-keeping body for competitive breath-hold events
• AIDA Hellas – National representative of AIDA International in Greece
• British Freediving Association (BFA) – British affiliate to AIDA International
• Confédération Mondiale des Activités Subaquatiques (CMAS) – International organisation for underwater activities

• British Sub-Aqua Club (BSAC) – Recreational diving club, training and certification agency based in the UK
• Cave Divers Association of Australia (CDAA) – Association to represent cave divers and administrate and support cave diving in Australia
• Cave Diving Group (CDG) – UK based cave diver training and certification agency
• Comhairle Fo-Thuinn (CFT) – Governing body for recreational diving and underwater hockey in Ireland
• Confédération Mondiale des Activités Subaquatiques (CMAS) – International organisation for underwater activities
• Federación Española de Actividades Subacuáticas (FEDAS) – Spanish national federation for underwater activities, affiliated to CMAS
• Fédération Française d'Études et de Sports Sous-Marins (FFESSM) – French diver training and certification agency
• International Association for Handicapped Divers (IAHD) – Non-profit organisation based in the Netherlands
• National Association for Cave Diving (NACD) – American non-profit organization for improving cave diving safety
• Woodville Karst Plain Project (WKPP) – Project and organization to map the underwater cave systems of the Woodville Karst Plain

• Historical Diving Society
• Nautical Archaeology Society (NAS) – British organisation to further research in nautical archaeology for the public benefit
• Save Ontario Shipwrecks (SOS) – A provincial heritage NGO in Ontario, Canada
• Sea Research Society – American nonprofit for marine research

• Australian Underwater Federation (AUF) – Governing body for underwater sports in Australia
• British Octopush Association (BOA) – National body for underwater hockey in the United Kingdom
• British Underwater Sports Association (BUSA) – British affiliate to the world underwater federation sports committee.
• Federación Española de Actividades Subacuáticas (FEDAS) – Spanish national federation for underwater activities, affiliated to CMAS
• Fédération Française d'Études et de Sports Sous-Marins (FFESSM) – French diver training and certification agency
• South African Underwater Sports Federation (SAUSF) – Official World Underwater Federation representative body in the Republic of South Africa
• Türkiye Sualtı Sporları Federasyonu (TSSF) – Turkish national governing body for underwater sport and lifesaving
• Underwater Society of America (USOA) – American national representative organization for underwater sport.

• Artificial Reef Society of British Columbia (ARSBC) – Canadian non-profit to create artificial reefs for habitat enhancement and recreation
• Divers Alert Network (DAN) – International group of not-for-profit organizations for improving diving safety
• Green Fins – Organisation in South East Asia for preservation of coral reefs by improving diver behavior