| OOS | Out-Of-Specification | 超标 |
| OOS | Ohio Odonata Society | 俄亥俄州Odonata协会 |
| OOS | Ottawa Orchid Society (Canada) | 渥太华兰花协会（加拿大） |
| OOS | Online Ordering Service | 在线订购服务 |
| OOS | On-Orbit Servicing | 在轨服务 |
| OOS | Orbit to Orbit Shuttle | 轨道到轨道穿梭机 |
| OOS | Order of Selection | 选择顺序 |
| OOS | Out of State | 州外 |
| OOS | Out of Scope | 超出范围 |
| OOS | Out of Synchronization | 不同步 |
| OOS | Occupational Overuse Syndrome (repetitive stress injury) | 职业过度使用综合征（重复性应激损伤） |
| OOS | OneSAF (One Semi-Automated Force) Objective System (OneSAF is an Army simulation) | OneSAF（一个半自动部队）目标系统（OneSAF是陆军模拟） |
| OOS | Oxfam Online Shop | 乐施会网上商店 |
| OOS | Outside of Society (Macromedia Flash game development team) | 社会之外（Macromedia Flash游戏开发团队） |
| OOS | Offshore Outsourced Services | 离岸外包服务 |
| OOS | Oracle of Seasons (video game in Zelda series) | 四季神谕（塞尔达系列视频游戏） |
| OOS | Out Of Service | 停用 |
| OOS | Online Operating System | 在线操作系统 |
| OOS | Out Of Specification | 不符合规范 |
| OOS | Origin of Symmetry | 对称性的起源 |
| OOS | ovarian overstimulation syndrome | 卵巢过度刺激综合征 |
| OOS | Occupational Overuse Syndrome | 职业过度使用综合症 |
| OOS | Optics Online Store | 光学在线商店 |
| OOS | Object-Oriented System | 面向对象系统 |
| OOS | Out Of Spec | 超出规格 |
| OOS | Ocean Observing System | 海洋观测系统 |
| OOS | Otm Overhead Signal | Otm高架信号 |
| OOS | Our Own Standards | 我们自己的标准 |
| OOS | Ostrich Operating System | 鸵鸟操作系统 |
| OOS | Out-Of-Sequence | 无序 |
| OOS | Out of Season | 淡季 |
| OOS | Out of School | 校外 |
| OOS | Opportunity of Selection | 选择的机会 |
| OOS | Optical Output Synchronizer | 光输出同步器 |
| OOS | Off-Line Operating Simulator | 离线操作模拟器 |
| OOS | Online Order Status | 在线订单状态 |
| OOS | Object-Oriented Systems | 面向对象系统 |
| OOS | Out of Style | 过时了 |
| OOS | Out of Sight | 视线之外 |
| OOS | Out of Straightness (pipeline condition leading to buckling) | 直线度偏差（导致屈曲的管道条件） |
| OOS | Out of Square | 不在广场上 |
| OOS | On-Orbit Operations Summary | 在轨运行总结 |
| OOS | Out of Shape | 变形 |
| OOS | Orbitto-Orbit Stage | 轨道到轨道阶段 |
| OOS | Order of Service (religious worship) | 服务秩序（宗教崇拜） |
| OOS | Out Of Service (police dispatch) | 停用（警察派遣） |
| OOS | Ohio Ornithological Society | 俄亥俄州鸟类学会 |
| OOS | ordinary organic solvents | 普通有机溶剂 |