| Acronym | Definition |
|---|
| OAS | Organization of American States |
| OAS | Office of Applied Studies (SAMHSA) |
| OAS | Oracle Application Server |
| OAS | Option Adjusted Spread |
| OAS | Office of the Assistant Secretary |
| OAS | Oral Allergy Syndrome |
| OAS | Organisation Armée Secrète |
| OAS | 2'-5' oligoadenylate synthetase |
| OAS | Old Age Security Act (Canada) |
| OAS | Office Automation System |
| OAS | Office of Administrative Services |
| OAS | Office of Aircraft Services |
| OAS | Organization of Agreement States |
| OAS | Offensive Air Support |
| OAS | Offensive Avionics System |
| OAS | Oman Aviation Services |
| OAS | Open Airways for Schools |
| OAS | Online Auction Site |
| OAS | On Another Subject |
| OAS | Organizational Assessment Survey |
| OAS | Ophthalmic Anesthesia Society |
| OAS | Organization of African States |
| OAS | Office of Aerospace Studies |
| OAS | Obstacle Avoidance Sonar |
| OAS | Online Account Services |
| OAS | Obstacle Avoidance System |
| OAS | Optical Access Switch (Quantum) |
| OAS | Oceanic Automation System |
| OAS | Optical Answer Sheet |
| OAS | Optical Automation Systems (Continuum Photonics) |
| OAS | Onizuka Air Station (USAF) |
| OAS | Optical Amplifier Section |
| OAS | Operations Automation System |
| OAS | Owner Activity Statement |
| OAS | Outsourcing Advisory Service |
| OAS | Originating AT&T Switch |
| OAS | Orbiter Attachment System |
| OAS | Operator Administration System (Bellcore) |
| OAS | Operation After Suspension |
| OAS | Optically Activated Semiconductor |
| OAS | Omnidirectional Airspeed Sensor |
| OAS | Oracle Advanced Scheduler |
| OAS | Online Application System (various organizations) |
| OAS | Open-Architecture-System (computing) |
| OAS | On-Access Scan (McAfee, Inc.) |
| OAS | Online Assessment System (software) |
| OAS | Office Automation Software |
| OAS | Office of Academic Services (various schools) |
| OAS | Oracle Advanced Security (software) |