| Acronym | Definition |
|---|
| OSIA | Order Sons of Italy in America |
| OSIA | On Site Inspection Agency |
| OSIA | Orlando Sanford International Airport (Orlando, FL) |
| OSIA | Open Source Industry Association |
| OSIA | On-Site Inspection Activity (US DoD) |
| OSIA | Open Source Industry Australia Limited (Australia) |
| OSIA | One Stop Italian America (online community) |
| OSIA | Open Standards and Internet Association |
| OSIA | Ohio Seed Improvement Association |
| OSIA | Oregon Self-Insurers Association |
| OSIA | Ohio Sheep Improvement Association |
| OSIA | Observers SWS Interactive Analysis |
| OSIA | Office of the Smithsonian Institution Archives |
| OSIA | Oregon Snowsport Industries Association |
| OSIA | Office Services and Information Agency |
| OSIA | Outstanding Student Instructor Awards |
| OSIA | Ottawa Services Insurance Agency (Canada) |
| OSIA | Open Systems Interconnection Architecture |
| OSIA | Order of the Society of Italian-Americans |