| Acronym | Definition |
|---|
| FES | Fundacion para la Educacion Superior (Spanish: Foundation for Higher Education) |
| FES | Flash Evaporator System |
| FES | Florida Entomological Society |
| FES | Festina Watches (Tour De France cycling sponsor) |
| FES | V-FES Feline Sarcoma Viral/V-FPS Fujinami Avian Sarcoma Viral Oncogene Homolog |
| FES | Fixed End System |
| FeS | Iron Sulpher |
| FES | Fine Error Signal |
| FES | Front End Screening |
| FES | Fleet Exercise Section |
| FES | Forced Entry Switch |
| FES | Free Enterprise System, Inc. (Jeffersonville, IN) |
| FES | Fuels Enterprise System (US DOD) |
| FES | Floor Elevation Survey |
| FES | Fluids Experiments System |
| FES | Fleet Electronics Shop |
| FES | Florida Engineering Solutions, Inc (San Antonio, FL) |
| FES | Falls Efficacy Scale (psychometrics) |
| FES | Forestry Environmental Studies (Yale University; New Haven, CT) |
| FES | Fuzzy Expert System |
| FES | Factor Evaluation System |
| FES | Front End Supervisor |
| FES | Front End System |
| FES | Functional Electrical Stimulation |
| FES | Flared End Section |
| FES | Follett Educational Services (Woodridge, IL) |
| FES | Fat Embolism Syndrome |
| FES | Full En-Suite (real estate) |
| FES | Flat Earth Society (band and organization) |
| FES | Fastiron Edge Switch (Foundry) |
| FES | Frisbie Elementary School (Wolcott, CT) |
| FES | Foreign Exchange Student |
| FES | Flywheel Energy Storage |
| FES | Fluent English Speaker |
| FES | Friedrich-Ebert-Stiftung (German political foundation) |
| FES | Florida Engineering Society |
| FES | Fiber Ethernet Switch (network management) |
| FES | Fire and Emergency Services |
| FES | Force Embedded Server (Force Computers) |
| FES | Florida Engineering Services, Inc (Miami, FL) |
| FES | Family Expenditure Survey (UK) |
| FES | Front-End Software |
| FES | Flextronics Enclosure Systems (division of Flextronics) |