| Acronym | Definition |
|---|
| OES | Original Equipment Supplier |
| OES | Occupational Employment Statistics |
| OES | Office of Emergency Services |
| OES | Order of the Eastern Star |
| OES | Optical Emission Spectrometry |
| OES | Optical Emission Spectroscopy |
| OES | Open Enterprise Server (Novell) |
| OES | Old English Sheepdog |
| OES | Oracle Entitlements Server |
| OES | Oregon Electric Station (Eugene, Oregon restaurant) |
| OES | Opera Enterprise Solution |
| OES | Open Enterprise Server |
| OES | Operating Environments |
| OES | Oregon Episcopal School |
| OES | Oracle Express Server |
| OES | Office of Engineering Services |
| OES | Occupational Exposure Standard |
| OES | Order Entry System (software) |
| OES | Ontario Electronic Stewardship (Canada) |
| OES | Oceans and International Environmental and Scientific Affairs (Department of State bureau) |
| OES | Office of Experiment Stations (USDA) |
| OES | Officer Education System (US Army) |
| OES | Office of Extended Studies (various schools) |
| OES | Online Evaluation System (various organizations) |
| OES | Online Employment System (various locations) |
| OES | Office Equipment Services (Naperville, IL) |
| OES | Oceanic Engineering Society |
| OES | Original Equipment Spares |
| OES | Open Enterprise Solutions (software; various locations) |
| OES | Office of Earth Science (NASA) |
| OES | Office of Education Services |
| OES | Office of Employment Security (US government) |
| OES | Offshore Engineering Society |
| OES | Officer Evaluation System |
| OES | Operational Engineering Support |
| OES | Orissa Environmental Society (India) |
| OES | Office of Employee Services |
| OES | Organization Executive Secretary (Scientology) |
| OES | Office of Executive Support |
| OES | Ontario Employment Standards (Canada) |
| OES | Oregon Environmental Systems (Beaverton, OR) |
| OES | Orbital Element Set (satellite) |
| OES | Ogretim Elemanlari Sendikasi (Turkish: Union of Teaching Staff) |
| OES | Operations Evaluation System |
| OES | Outbreak Elimination Squad (gaming clan) |
| OES | Operational Effectiveness Systems (enterprise software to manage organizational knowledge & work processes) |
| OES | Outside Electrical Supply |
| OES | Ownship Environment Simulator |
| OES | Optically Excited System |