| Acronym | Definition |
|---|
| FCAS | Familial Cold Autoinflammatory Syndrome |
| FCAS | Fairfax County Animal Shelter (Fairfax, VA) |
| FCAS | Fellow of the Casualty Actuarial Society |
| FCAS | Franklin County Animal Shelter (Farmington, ME) |
| FCAS | Frequency Control Ancillary Services (electric power industry) |
| FCAS | Fatigue Critical Alteration Structure (aviation) |
| FCAS | Franklin College of Arts and Sciences (University of Georgia) |
| FCAS | Fellowship of Christian Athletes and Students |
| FCAS | Foam Core Addicts Society |
| FCAS | Fragile & Conflict-Affected State |
| FCAS | Flight Control Augmentation System |
| FCAS | Fullerton College Associated Students |