| Acronym | Definition |
|---|
| FAS | Fetal Alcohol Syndrome |
| FAS | Federation of American Scientists (est. 1945; Washington, DC) |
| FAS | Foreign Agricultural Service |
| FAS | Financial Accounting Standards |
| FAS | Federal Acquisition Service (GSA) |
| FAS | For A Second |
| FAS | Faculty of Arts and Sciences |
| FAS | Free Alongside Ship (shipping) |
| FAS | Fatty Acid Synthase |
| FAS | Forskningsrådet för Arbetsliv och Socialvetenskap (Swedish Council for Working Life and Social Research) |
| FAS | Federal Antimonopoly Service (Russia) |
| FAS | Foreign Agriculture Service |
| FAS | Fabric Attached Storage |
| FAS | Football Association of Singapore |
| FAS | Freely Associated States (Micronesia) |
| FAS | Fassa Bortolo (Tour de France cycling sponsor) |
| FAS | Forms Automation System |
| FAS | Federation of Atomic Scientists (now Federation of American Scientists) |
| FAS | Fire Alarm System |
| FAS | Foreign Accent Syndrome |
| FAS | Fixed Asset System |
| FAS | Frame Alignment Signal |
| FAS | Frozen At Sea (commercial fishing) |
| FAS | Full Auto Shooting (cameras) |
| FAS | Federation of Astronomical Societies |
| FAS | First Aid Squad |
| FAS | Firsts and Seconds (lumber/forest industry) |
| FAS | Fuels Automated System |
| FAS | Financial Advisory Service |
| FAS | Frequency Assignment Subcommittee |
| FAS | Final Assembly Schedule |
| FAS | Fine Arts Society (Indianapolis, IN) |
| FAS | French Academy of Sciences |
| FAS | Fueling-At-Sea |
| FAS | Farm-A-Syst |
| FAS | Facility Associated Signalling |
| FAS | Flow Admission Service |
| FAS | Financial Analysis System |
| FAS | flywheel alternator starter |
| FAS | Foreign Area Studies |
| FAS | Family Arabian Stallion (Breyer mold) |
| FAS | Federal Aviation Service (Russia) |
| FAS | Functional Area Services |
| FAS | Fire Alarm and Signal (cable) |
| FAS | Functional Address Symbol |
| FAS | Field Artillery System |
| FAS | Flexible Access System |
| FAS | Faible Activité Spécifique (French: low specific activity) |
| FAS | Force Accounting System |
| FAS | Functional Area Supervisor (US Navy NTCSS) |
| FAS | Frequency Allocation Support |
| FAS | Apoptosis Stimulating Fragment (programmed cell death) |
| FAS | Fresh Air Setup |
| FAS | Field Artillery Section |
| FAS | Freight Alongside Ship |
| FAS | Fine Arts Seminar |
| FAS | Force Augmentation System (military aviation; helicopters) |
| FAS | Field Alert Status |
| FAS | Final Approach Surface |
| FAS | Force Analysis Simulation |
| FAS | FOS Analysis Subsystem |
| FAS | Facility Analysis Session |
| FAS | Forensic Ammunition Service |
| FAS | Feature Analysis Services |
| FAS | Facilities and Administrative Support Division |
| FAS | Fleet Application Server (Navy) |
| FAS | Fellow of the Antiquarian Socity |
| FAS | Fleet Attack Submarine |
| FAS | Femmes Afriques Solidarité (French) |
| FAS | Funny As Stuff (polite form) |
| FAS | Flap Actuation System |
| FAS | Functional Architecture Study |
| FAS | Formation Assembly Ship (US Army Air Force, World War II) |
| FAS | Felony Action Squad (New Orleans Police Department) |
| FAS | Functional Area Sponsor |
| FAS | Future American Schools (Alexandria, Egypt) |