| Acronym | Definition |
|---|
| CAAS | Civil Aviation Authority of Singapore |
| CaaS | Communications-as-a-Service (outsourcing model for enterprise communications) |
| CAAS | Commission on Accreditation of Ambulance Services |
| CAAS | Central Arkansas Astronomical Society |
| CAAS | Common Avionics Architecture System |
| CAAS | Chet Atkins Appreciation Society (Nashville, TN) |
| CAAS | Chinese Academy of Agricultural Science |
| CAAS | Cardiovascular Angiography Analysis System |
| CAAS | Canadian Association of African Studies |
| CAAS | Center for Alcohol and Addiction Studies |
| CAAS | Criticality Accident Alarm System (nuclear) |
| CAAS | Center for Afro-American and African Studies |
| CAAS | Contractor Advisory and Assistance Services |
| CAAS | Cruise Agent Accreditation Scheme (PSARA; United Kingdom) |
| CAAS | Common Aviation Architecture System (US DoD) |
| CAAS | Contract Advisory Assistance Services |
| CAAS | Chloride Aqueous Actinide Separation |
| CAAS | Commercial Activity Automated System |
| CAAS | Contractor Assistance and Advisory Service |
| CAAS | Community Accounting Aid Service |
| CAAS | Computer-Aided Assessment System |
| CAAS | Common Authentication and Authorization Service |
| CAAS | Changi Aviation Authority of Singapore |
| CAAS | Combined Arms And Support |
| CAAS | Combined Artillery/Aviation Simulator |
| CAAS | Computer Apathy and Anxiety Scale |
| CAAS | Chemical Agent Alarm System |