| Acronym | Definition |
|---|
| OSGA | Open Grid Services Architecture |
| OSGA | Off Shore Gaming Association |
| OSGA | Ontario Seniors' Games Association (Canada) |
| OSGA | Oklahoma Student Government Association |
| OSGA | Owen Student Government Association (Vanderbilt University) |
| OSGA | Office of the Secretary General in Afghanistan |
| OSGA | Oregon Sheep Growers Association |
| OSGA | Ontario Seed Growers' Association |
| OSGA | Ozark Steel Guitar Association |
| OSGA | Ohio Student Government Association (est. 2007; various universities) |
| OSGA | Open Source Grid Architecture |
| OSGA | Open Systems Group Associates |
| OSGA | Occupational Specialist/Guidance Association |