| Acronym | Definition |
|---|
| FIS | Flood Insurance Study |
| FIS | Fidelity Information Services (various locations) |
| FIS | Faculty of Information Studies |
| FIS | Financial Information System |
| FIS | Future Internet Symposium |
| FIS | Federation International de Ski |
| FIS | Fondo de Inversión Social (Spanish: Social Investment Fund; various nations) |
| FIS | Front Islamique du Salut (Islamic Salvation Front) |
| FIS | Full Information System |
| FIS | File Input Stream |
| FIS | Factory Installation Services |
| FIS | Fingerprint Identification System |
| FIS | Fuel Injection System |
| FIS | Family Income Supplement (Ireland) |
| FIS | Forage Information System (Oregon State University) |
| FIS | Far-Infrared Surveyor |
| FIS | Federal Investigative Services (Office of Personnel Management) |
| FIS | Fighter Interceptor Squadron |
| FIS | Fuzzy Inference System |
| FIS | Flight Information Service |
| FIS | Federazione Italiana Scherma (Italian Fencing Federation) |
| FIS | Fluorescence Imaging System |
| FIS | Fixed Income Securities |
| FIS | Friends of International Students (various schools) |
| FIS | Flandreau Indian School (Flandreau, SD) |
| FIS | Fatigue Impact Scale (quality of life questionnaire) |
| FIS | Financial Information Service |
| FIS | Foreign Intelligence Service |
| FIS | Federal Inspection Services |
| FIS | Frame Information Structure |
| FIS | First Interstate (Bank) Service |
| FIS | Fourniture Industrie Service (French: Service Industry Provision) |
| FIS | Frankfurt International School |
| FIS | Financial Institutions Services (Jamaica) |
| FIS | Foreign Intelligence Section (Canada) |
| FIS | Forest Invasive Species |
| FIS | Federazione Italiana dello Scautismo (Italian: Federation of Italian recognized scout and guide organizations) |
| FIS | Family Impact Seminar (various locations) |
| FIS | Federal Inspection Station |
| FIS | French International School (Hong Kong) |
| FIS | Free Into Store |
| FIS | Free-In-Store |
| FIS | Fabrication Inspection System |
| FIS | Facility Interface Sheet (US NASA) |
| FIS | Fault Indication Signal |
| FIS | Fisherman's Insurance Services, Inc |
| FIS | Florida Irrigation Society |
| FIS | Foundation for Infinite Survival |
| FIS | Field Information Support (United Nations) |
| FIS | Fixed Interval Smoothing |
| FIS | Friends Ivory Sime (UK) |
| FIS | Functional Interface Specification |
| FIS | Fairway Information System (European Union) |
| FIS | Financial and Information Services |
| FIS | Florida Irrigation Supply, Inc (Sanford, Florida) |
| FIS | Freedom Imaging Systems (Lockport, IL) |
| FIS | Flight Instrumentation System |
| FIS | Fleet Introduction Site |
| FIS | Firefighters' Integrated Suit |
| FIS | Federation of International Seedsmen |
| FIS | Flight Interceptor Squadron |
| FIS | Fax Idle Suppression |
| FIS | Fire Inhibit Switch (Aegis Combat System) |
| FIS | Feedback Information System |
| FIS | Friendly Information System |
| FIS | Fault Isolation Software |
| FIS | Foreign Instrumentation System |
| FIS | Federation International du Slot (International sanctioning body for H.O. scale slot car racing) |
| FIS | Foundation Information Systems, Incorporated (Charlotte, NC) |
| FIS | Fast-Idle Solenoid (electronic engine idle speed/vacuum control device) |
| FIS | Fact Information Sheet |
| FIS | Formation Internet Service (French: Internet Service Training) |
| FIS | Force Information Service |
| FIS | Fundamental Intermittent Standard |