- PADI - official site for the Professional Association of Diving Instructors.
- NAUI - official site for the National Association of Underwater Instructors for use by scuba divers of all associations to promote diving safety and education.
- International Association of Nitrox and Technical Divers - IANTD is the only EANx agency that offers training in all aspects of EANx through continuing education programs.
- International Association of Technical and Nitrox Divers, Inc - training organization of Nitrox, enriched and enhanced air, technical divers and instructors.
- CMAS - Confédération Mondiale des Activités Subaquatiques - world underwater federation.
- Global Underwater Explorers - dive certification for overhead, technical, and exploration diving, as well as aquatic activity in education, research, and exploration.
- HSA International - internationally recognized certifying organization for disabled scuba divers.
- Sub-Aqua Association - representative body for independent SCUBA diving clubs in the U.K.
- National Association of Black Scuba Divers (NABS) - family-oriented club whose member interests focus on the promotion of scuba diving, environmental conservation, and education. Includes news, events, and more.
- United States Dental Diving Association, Inc. (USDDA) - offers a combined dental seminar and scuba diving trip to locations worldwide.
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