| CAS | Chemical Abstracts Service | - | Computer Acronyms(common) |
| CAS | Calibrated Airspeed | - | Organizations |
| CAS | Command Augmentation System | - | Organizations |
| CAS | Control Augmentation System | - | Organizations |
| CAS | Crack A Smile | - | ISO Country Codes |
| CAS | Clear As Sh*t | - | ISO Country Codes |
| CAS | Chemical Abstracts Service - Chief Of The Air Staff - Close Air Support | - | Astronomy |
| CAS | Cooperative Application Satellite | - | Business and Finance |
| CAS | Committee On Atmospheric Sciences | - | Business and Finance |
| CAS | Commission For Atmospheric Science | - | Business and Finance |
| CAS | Climate Analysis Section | - | Business and Finance |
| CAS | Center For Automotive Safety | - | Business and Finance |
| CAS | Chemical Abstract Service | - | Business and Finance |
| CAS | channel associated signaling
| - | Human Genome |
