| FCAS | F The Casualty Actuarial Society 
| Others |
| FCAS | Familial Cold Auto-inflammatory Syndrome
| Others |
| FCAS | Familial Cold Autoinflammatory Syndrome
| Others |
| FCAS | Feinstein College of Arts and Sciences
| Others |
| FCAS | Fellow Casualty Actuarial Society
| Others |
| FCAS | Fellow of Casualty Actuarial Society
| Others |
| FCAS | Fellow of the Caribbean Academy of Sciences
| Others |
| FCAS | Fellow of the Casualty Actuarial Society
| Others |
| FCAS | Fellowship of Christian Athletes and Students
| Others |
| FCAS | Field Certified Applications Specialist
| Others |
| FCAS | Flinders Centre for Ageing Studies
| Others |
| FCAS | Florence County Agricultural Society
| Others |
| FCAS | Florence Culinary Art School
| Others |
| FCAS | Fractal Complex Adaptive System
| Others |
| FCAS | Franklin County Agricultural Society
| Others |
| FCAS | Frequency Control Ancillary Service
| Others |
| FCAS | Frequency Control Ancillary Services
| Others |
| FCAS | Frogmore Centre For Advanced Studies
| Others |
| FCAS | Fulton County Animal Services
| Others |
| FCAS | Future Combat Air System
| Military, Air Force |