| OOS | Object Oriented Simulation 
| Others |
| OOS | Object Oriented Software
| Others |
| OOS | Object Oriented Specification
| Others |
| OOS | Object Oriented Storage
| Others |
| OOS | Object Oriented System
| Others |
| OOS | Object-Oriented System
| Others |
| OOS | Occupational Overuse Syndrome
| Others |
| OOS | Ocean Observation Systems
| Others |
| OOS | Ocean Observing System
| Others |
| OOS | of Out of Specification
| Others |
| OOS | Offers of Service
| Others |
| OOS | Office of Operational Systems
| Others |
| OOS | Office Of Structures
| Others |
| OOS | Office Online Server
| Others |
| OOS | Officer On Scene
| Others |
| OOS | Official Observer Station
| Others |
| OOS | Offline Operating Simulator
| Others |
| OOS | Ohio Ophthalmological Society
| Others |
| OOS | Ohio Ornithological Society
| Others |
| OOS | on Off Road Severe Application
| Others |
| OOS | On Orbit Station
| Others |
| OOS | On-Orbit Station
| Others |
| OOS | Online Order System
| Others |
| OOS | Online Ordering Service
| Others |
| OOS | Ooc Operating System
| Others |
| OOS | Opel On Star
| Others |
| OOS | Open Office Spreadsheet
| Others |
| OOS | OpenOffice org spreadsheet
| Others |
| OOS | Operation Ocean Shield
| Others |
| OOS | Optics Online Store
| Others |
| OOS | Oranges Or Strawberries
| Others |
| OOS | Orbit-to-Orbit Shuttle
| Others |
| OOS | Orbit-to-Orbit Stage
| Others |
| OOS | Oregon Offender Search
| Others |
| OOS | Organic Operating System
| Others |
| OOS | Ostrich Operating System
| Others |
| OOS | Other Orbit Senshi
| Others |
| OOS | OTM (Optical Transport Module) Overhead Signal
| Others |
| OOS | Our Own Standards
| Others |
| OOS | Out Of Sample
| Others |
| OOS | Out Of School
| Others |
| OOS | Out Of Scope
| Others |
| OOS | Out Of Season
| Others |
| OOS | Out Of Service
| Others |
| OOS | Out Of Shield
| Others |
| OOS | Out of Sight
| Others |
| OOS | Out Of Specification
| Others |
| OOS | Out Of Standard
| Others |
| OOS | Out of State
| Others |
| OOS | Out of State/ Out Of Sorts/ Out Of Shillings
| Others |
| OOS | Out Of Story
| Others |
| OOS | Out Of Style
| Others |
| OOS | Out of Subject
| Others |
| OOS | Out Of Sync
| Others |
| OOS | Out Of Synchronization
| Others |
| OOS | Out Of System
| Others |
| OOS | Overseas Occupational Standards
| Others |
| OOS | Overseas Occupational Syndrome
| Others |