| OAS | Isuzu Oasis 
| Others |
| OAS | Oakland Animal Services
| Others |
| OAS | Object Addressable Storage
| Others |
| OAS | Objective Advantage Scope
| Others |
| OAS | Obstacle Assessment Surface
| Others |
| OAS | Obstacle Avoidance System
| Military, Air Force, Technology, Transport |
| OAS | Occupational Assessment Services
| Others |
| OAS | Odisha Administrative Service
| Others |
| OAS | Offensive Air Support
| Others |
| OAS | Office Administration System
| Others |
| OAS | Office Administrative Secretary
| Others |
| OAS | Office Automation System
| Others |
| OAS | Office Automation Systems
| Others |
| OAS | Office of Addiction Services
| Others |
| OAS | Office of Administrative Services
| Others |
| OAS | Office of Aircraft Services
| Others |
| OAS | Office of Applied Studies
| Others |
| OAS | Office of Audit Services
| Others |
| OAS | Office of Aviation Services
| Others |
| OAS | Office of Aviation Services's
| Others |
| OAS | Offshore Access System
| Others |
| OAS | Ohio Academy of Science
| Others |
| OAS | Oil Activity Surface
| Others |
| OAS | Oklahoma Academy of Science
| Others |
| OAS | Ola's Auto Services
| Others |
| OAS | Old Age Security
| Others |
| OAS | Olympic Archery in Schools
| Others |
| OAS | Oman Auto Show
| Others |
| OAS | On Access Scanner
| Others |
| OAS | On Active Service
| Others |
| OAS | On American Soil: How Justice Became a Casualty of World War II
| Others |
| OAS | One Angry Swede
| Others |
| OAS | Oneonta Auxiliary Services
| Others |
| OAS | Online Admission System
| Others |
| OAS | Online Application System
| Others |
| OAS | Online Assessment System
| Others |
| OAS | Online Assisted Support
| Others |
| OAS | Online Auction Site
| Others |
| OAS | Open Alternative School
| Others |
| OAS | Open Application Server
| Others |
| OAS | Operation Animal Shelter
| Others |
| OAS | Operations Automation System
| Others |
| OAS | Ophthalmic Anesthesia Society
| Others |
| OAS | Optimum Additive Solution
| Others |
| OAS | Option Adjust Spread
| Others |
| OAS | Option Adjusted Spread
| Others |
| OAS | Option Adjusted Spreads
| Others |
| OAS | Oracle Advanced Security
| Others |
| OAS | Oracle Application Server
| Others |
| OAS | Oral Allergy Syndrome
| Others |
| OAS | Orbiter Aeroflight Simulator
| Others |
| OAS | Orbiter Atmospheric Simulator
| Others |
| OAS | Orbiter Avionics Software
| Others |
| OAS | Orbiter Avionics System
| Others |
| OAS | Ordinary Attire Studio
| Others |
| OAS | Oregon Adaptive Sports
| Others |
| OAS | Organisation of American States
| Others |
| OAS | Organization of African States
| Others |
| OAS | Organization of Agreement States
| Others |
| OAS | Organization of American States
| Others |
| OAS | Organization of Arab States
| Others |
| OAS | Orissa Administative Service
| Others |
| OAS | Oshikai Advertising Services
| Others |
| OAS | Other American States
| Others |
| OAS | Overpayments And Accounting Summary
| Others |