| Acronym | Definition |
|---|
| EOS | Earth Observing System |
| EOS | End of Sale |
| EOS | Equation(s) Of State |
| EOS | End of Support |
| EOS | Equations of State |
| EOS | European Optical Society |
| EOS | Electrical Overstress |
| EOS | End Of Screen |
| EOS | Eosinophil |
| EOS | Ethernet Over SONET (Synchronous Optical Network) |
| EOS | End of Season |
| EOS | Electro-Optical System (Canon Cameras) |
| EOS | Economies of Scale |
| EOS | End of Story |
| EOS | End Of String |
| EOS | Earth Observation Satellite |
| EoS | Edge of Sanity (band) |
| EOS | Employee Opinion Survey |
| EOS | End of Sequence |
| EOS | Enemy Of the State |
| EOS | End of Session |
| EOS | End of Study |
| EOS | Erweiterte Oberschule (extended high school; Germany) |
| EOS | End of Show (IRC) |
| EOS | Egyptian Organization for Standardization and Quality Control |
| EOS | Electronic Order System |
| EOS | Equation Operating System |
| EOS | Electro-Optic Sampling |
| EOS | Electronic Office Supplies |
| EOS | End of Shift |
| EOS | Electro-Optical Sensor |
| EOS | End Of Selection |
| EOS | Explorers of Sky (game) |
| EOS | Egyptian Orthodontic Society |
| EOS | ECC on SIMM |
| EOS | Earth Orbiting System |
| EOS | English for Office Skills |
| EOS | Enhanced Operating System |
| EOS | End of Set |
| EOS | Electrophoresis Operations in Space |
| EOS | Equivalent Opening Size (geotextile fabrics) |
| EOS | Educational Opportunity Service (ACT, Inc.) |
| EOS | Emergency Oxygen System |
| EoS | Eater of Souls (gaming) |
| EOS | Electro-Optical Systems, Inc. |
| EOS | Estimate of the Situation |
| EOS | École Ouvrière Supérieure (French; graduate school; Brussels, Belgium) |
| EOS | Early-Onset Sarcoidosis |
| EOS | Enclosed Operating Station |
| EOS | Edge-Of-Saturation |
| EOS | Earth Orbit Shuttle |
| EOS | Engineering Operating Station |
| EOS | Executive & Operating System |
| EOS | End Of Sweep |
| EOS | Establishment of Cohesion |
| EOS | Extended Ownership Security |
| EOS | Exxon Office Systems |
| EOS | Equipment Out of Service |
| EOS | Emergency Oil System |
| EOS | Electronic Online Services |
| EOS | Eagles of Serbia (virtual flight squadron) |
| EOS | Environmental Outreach & Stewardship |
| EOS | Eligible for Overseas |
| EOS | EBO Synchronizer (DoD) |
| EOS | Executive Off-Site |
| EOS | Emergency Operations Staff |
| EOS | Employed Operational State |
| EOS | Earth Observing Station |
| EOS | Extended Operation System |
| EOS | Extended Output System |
| EOS | Evolutionary Object Store |
| EOS | Extended Observation Service (healthcare) |
| EOS | Equipment Only Support |
| EOS | Engine Order System |
| EOS | Epidemiological Outbreak Surveillance |
| EOS | End of Service (various companies) |
| EOS | Enterprise Open Source (software) |
| EOS | Enterprise Operating System (software) |
| EOS | Extension of Stay (various organizations) |