| Abbreviation | Definition |
|---|---|
| OEC | Opus Embedded Command |
| OEF | Open ECDIS Forum |
| OES | Object Extension Specification |
| OF | Output File |
| OFA | Optimal Flexible Architecture |
| OFF | Object File Format |
| OFH | Open File Handler |
| OFJ | Objectivity For Java |
| OFTP | Odette File Transfer Protocol |
| OFW | Original Firmware |
| OFWG | Open Firmware Working Group |
| OGC | Open GIS Consortium |
| OGCM | Ocean General Circulation Models |
| OGCM | Oceanic General Circulation Model |
| OGF | Oracle Government Financials system |
| OGG | Overly Garganuated Gonads |
| OGH | Olean General Hospital |
| OGH | Opelousas General Health |
| OGH | Ottawa General Hospital |
| OGSA | Open Grid Services Architecture |