| OSAS | Obstructive Sleep Apnoea syndrome | |
| OSAS | Once Saved Always Saved | |
| OSAS | Office Of Substance Abuse Studies | |
| OSAS | Onsite Solutions Application Server | |
| OSAS | Office of Substance Abuse Services | |
| OSAS | Overseas Service Aid Scheme | |
| OSAS | Of Scandinavian Airlines System | |
| OSAT | Outsource Semiconductor Assembly and Test | |
| OSAT | Outsourced Semiconductor Assembly and Testing | |
| OSAT | Outsourced Semiconductor Assembly Test | |
| OSAT | Office for the Study of Automotive Transportation | |
| OSAT | Outsourced Semiconductor Assembly and Test | |
| OSAT | Out of Service Analog Test | |
| OSAT | Outsourced Semiconductor Assembly and Test | |
| OSAT | Out-Of-Service Analog Test | |
| OSAT | One School At a Time | |
| OSAT | Open Source Appropriate Technology | |
| OSAT | Open-Source Appropriate Technology | |
| OSAT | Observing Systems and Advanced Technology | |
| OSAT | Ozone Source Apportionment Technology | |
| OSAT | One Step at A Time | |
| OSAT | On Site Assessment and Training | |
| OSAT | Overleg Scholing Arbeidsmarkt Theatertechniek | |
| OSAT | Online Schooling And Training | |
| OSAT | Open Space Assessment Tool |
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