| Acronym | Definition |
|---|
| OGA | Office of the General Assembly |
| OGA | Office Genuine Advantage (Microsoft) |
| OGA | Ogallala, Nebraska (airport code) |
| OGA | Ordinary General Assembly (various organizations) |
| OGA | Ontwikkelingsbedrijf (Dutch) |
| OGA | Office Genuine Advantage |
| OGA | Other Government Agency |
| OGA | Oregon Gymnastics Academy (Beaverton, OR) |
| OGA | Online Gaming Alliance |
| OGA | Open Graded Asphalt (surfacing material) |
| OGA | Ontario Gerontology Association (Ontario, Canada) |
| OGA | Obstetrical & Gynecological Associates (various locations) |
| OGA | Oracle Grants Accounting (financial software) |
| OGA | Oil and Gas Advisory (publication) |
| OGA | Outer Gimbal Angle |
| OGA | Outer Gimbal Axis (US NASA) |
| OGA | Old Growth Area (land management) |
| OGA | Online Gaming Addicts (gaming clan) |
| OGA | Organismos Georgikon Asfaliseon (Greek Agriculture Social Security) |
| OGA | Original Game Audio |
| OGA | Online Gamers Association |
| OGA | Orthogonal Greedy Algorithm |
| OGA | Organized Grab Ass |
| OGA | Österreichische Gesellschaft für Angiologie (Austrian Society of Angiology) |