| Acronym | Definition |
|---|
| OOS➣Out of Stock |
| OOS➣Out Of Service (police dispatch) |
| OOS➣Out of State |
| OOS➣On Other Sites |
| OOS➣Object Oriented Software |
| OOS➣Out of Service |
| OOS➣Out of System |
| OOS➣Object Oriented Simulation |
| OOS➣Object Oriented Specification |
| OOS➣Object Oriented Storage |
| OOS➣Offline Operating Simulator |
| OOS➣Open Office Spreadsheet |
| OOS➣Object Oriented System |
| OOS➣Occupational Overuse Syndrome (repetitive stress injury) |
| OOS➣Out Of Specification |
| OOS➣Origin of Symmetry |
| OOS➣Out of School |
| OOS➣Oracle of Seasons (video game in Zelda series) |
| OOS➣Out-Of-Sequence |
| OOS➣Out of Sight |
| OOS➣Order of Service (religious worship) |
| OOS➣Object-Oriented Systems |
| OOS➣Out of Style |
| OOS➣Out of Scope |
| OOS➣Online Operating System |
| OOS➣Order of Selection |
| OOS➣Object Oriented Specification (computing) |
| OOS➣Orbicularis Oris Superior |
| OOS➣On-Orbit Servicing |
| OOS➣Out of Supply |
| OOS➣Out of Shape |
| OOS➣Out of Season |
| OOS➣Off-Line Operating Simulator |
| OOS➣Ohio Ornithological Society |
| OOS➣Order of Sargeras (gaming guild) |
| OOS➣Outside of Society (Macromedia Flash game development team) |
| OOS➣Out of Synchronization |
| OOS➣Out of Straightness (pipeline condition leading to buckling) |
| OOS➣On-Orbit Operations Summary |
| OOS➣Online Order Status |
| OOS➣Offshore Outsourced Services |
| OOS➣Ohio Odonata Society |
| OOS➣Orbit to Orbit Shuttle |
| OOS➣Ottawa Orchid Society (Canada) |
| OOS➣Oxfam Online Shop |
| OOS➣Out of Square |
| OOS➣Oregon Orchid Society (Portland, OR) |
| OOS➣Online Ordering Service |
| OOS➣Office Operations Supervisor (US Census Bureau) |
| OOS➣Opportunity of Selection |
| OOS➣OneSAF (One Semi-Automated Force) Objective System (OneSAF is an Army simulation) |
| OOS➣Optical Output Synchronizer |
| OOS➣Orbitto-Orbit Stage |