| FCGS | Fairfield County Genealogy Society
| Others |
| FCGS | Fateh Center for Gifted Students
| Others |
| FCGS | Feline Chronic Gingivitis Stomatitis
| Others |
| FCGS | Feline Chronic Gingivo Stomatitis
| Others |
| FCGS | Female Cosmetic Genital Surgery
| Others |
| FCGS | Fibre Channel Generic Services
| Others |
| FCGS | Fomento Cultural Grupo Salinas
| Others |
| FCGS | Four Corners Geological Society
| Others |
| FCGS | Freeborn County Genealogy Society
| Others |
| FCGS | Freestone County Genealogical Society
| Others |
| FCGS | Frequency Chaos Game Signal
| Others |
| FCGS | Fries Center for Global Studies
| Others |
| FCGS | Fulham Cross Girls School
| Others |
| FCGS | Funeral Consumer Guardian Society
| Others |