CMAS may stand for:
CMAS (gene), the human enzyme cytidine monophosphate N-acetylneuraminic acid synthetase Center for Mexican American Studies, an academic research center at University of Texas at Arlington Commercial Mobile Alert System (now called Wireless Emergency Alerts), a system for distributing geo-targeted alerts to mobile devices Confédération Mondiale des Activités Subaquatiques, the international umbrella organization for underwater sports and recreational diving CMAS* scuba diver and CMAS** scuba diver, diving certifications Coordination des Mouvements, Associations et Sympathisants, founded by Mahmoud Dicko
See also CMA (disambiguation)