This article lists notable underwater diver certification agencies. These include certification in cave diving, commercial diving, recreational diving, technical diving and freediving. Diver certification agencies are organisations which issue certification of competence in diving skills under their own name, and which train, assess, certify and register the instructors licensed to present courses following the standards for the certification they issue.
Recreational scuba diving certification agencies
Organisations which publish standards for competence in recreational scuba diving skills and knowledge, and issue certification for divers assessed as competent against these standards by affiliated schools or instructors: