| Acronym | Definition |
|---|
| FCS | Frame Check Sequence |
| FCS | Flight Control System |
| FCS | Fibre Channel Standard |
| FCS | Future Combat Systems (US Army) |
| FCS | Fetal Calf Serum |
| FCS | Family and Consumer Sciences |
| FCS | Football Championship Subdivision |
| FCS | Fluorescence Correlation Spectroscopy |
| FCS | Facultad de Ciencias Sociales (Spanish: Social Sciences Faculty) |
| FCS | Fire Control System |
| FCS | Foreign Commercial Service |
| FCS | First Customer Shipment |
| FCS | Fox College Sports |
| FCS | Family and Community Services |
| FCS | Federation of Communication Services (UK) |
| FCS | Foundations of Computer Security |
| FCS | Finite Capacity Scheduling |
| FCS | Fellowship of Christian Students |
| FCS | Flow Cytometry Standard |
| FCS | Frequency Control Symposium (IEEE) |
| FCS | Fast Circuit Switching (ATMF) |
| FCS | Frame Check Sum |
| FCS | Food, Clothing, Shelter (poverty measurement, subsistence) |
| FCS | Feedback Control System |
| FCS | Federal Catalog System |
| FCS | Florence Crittenton Services |
| FCS | Finite Coordinate Space |
| FCS | Faciocutaneoskeletal Syndrome (aka Costello Syndrome) |
| FCS | Florida Citrus Sports |
| FCS | First Commercial Shipment (software release) |
| FCS | Flexible Careers Scheme (UK) |
| FCS | Food Contact Surface |
| FCS | File Control System |
| FCS | Financial Control System (Sprint) |
| FCS | Fuel Control System |
| FCS | Farm Consultation Service (Canada) |
| FCS | Fredericksburg Christian School |
| FCS | Focal Glomerulosclerosis |
| FCS | Federal Cyber Services |
| FCS | Fort Calhoun Station |
| FCS | Fresno Christian Schools (Fresno, CA) |
| FCS | Fulton County Stadium (Atlanta, GA) |
| FCS | Finnish Cardiac Society (Oulu, Finland) |
| FCS | Free Channel Search |
| FCS | Facility Checking Squadron |
| FCS | Fibre Channel System |
| FCS | Fellow of the Chemical Society |
| FCS | Flight Crew Systems |
| FCS | Free Cutting Steel |
| FCS | Fire Control Section |
| FCS | Colorado Springs Butts AAF United States (airport code) |
| FCS | Facsimile Communication System |
| FCS | Final Candidate Status |
| FCS | Framingham Children's Study |
| FCS | Fading Channel Simulator |
| FCS | Fire Controlman, Submarine |
| FCS | Foundation for A Civil Society, Ltd. |
| FCS | Fast Cell Search |
| FCS | Faceted Classification Schema |
| FCS | Frequency Conversion Subsystem |
| FCS | Forward Control Section |
| FCS | Fussball Club Schaffhausen (Swiss soccer club) |
| FCS | Ferrocarriles Salitreros de Tarapacá (Spanish, railway) |
| FCS | Flesh Craving Supermen (band) |
| FCS | Flag Check Sequence |
| FCS | Field Crop Sprayer |
| FCS | Failure Characterization Subsystem |
| FCS | Fiber Characterization Services |
| FCS | Free Choice Screening Test |
| FCS | Factory Communication System |
| FCS | Fire Control Simulator |
| FCS | Family/Category Specialist |
| FCS | Funding Control System (Department of the Army) |
| FCS | Flexnet Controller System (Bellcore) |
| FCS | Forecasted Component Schedule |
| FCS | Fletcher Cemetery Site (Historical Indian Burial Site, Bay City, Michigan) |