| IOS | IGOSS Observing System | 综合性全球海洋服务系统管理的观测系统 |
| IOS | Intelligent Out Station | 智能外围站 |
| IOS | Internetworking Operation System | 連網作業系統 |
| IOS | Integrated Office System | 集成办公室系统 |
| IOS | Intelligent Office System | 智能办公室系统 |
| IOS | Interactive Operating System | 交互式操作系统 |
| IOS | Internet Operating System | 因特网操作系统 |
| IOS | Internetwork Operating System | 网间操作系统 |
| IOS | International Oak Society | 国际橡树协会 |
| IOS | Ilheus, Bahia, Brazil - Eduardo Gomes (Airport Code) | Ilheus，巴伊亚，巴西-Eduardo Gomes（机场代码） |
| IOS | Institute of Ocean Sciences (Canada) | 海洋科学研究所（加拿大） |
| IOS | Internet Ophthalmology Society | 互联网眼科学会 |
| IOS | Institute for Orgonomic Science | 组织科学研究所 |
| IOS | Institute of Oceanographic Sciences | 海洋科学研究所 |
| IOS | Internet Over Satellite | 卫星互联网 |
| IOS | Improved Oceanographic Sensor | 改进的海洋学传感器 |
| IOS | Input/Output Subsystem | 输入/输出子系统 |
| IOS | Inter-Operability Specification | 互操作性规范 |
| IOS | Illinois Orthopaedic Society | 伊利诺伊州骨科学会 |
| IOS | Interorganizational Information System | 组织间信息系统 |
| IOS | Institute of Sociology | 社会学研究所 |
| IOS | Input/Output Supervisor | 输入输出管理程序 |
| IOS | Input Output System | 输入输出系统 |
| IOS | Ilheus, BA, Brazil | Ilheus，BA，巴西 |
| IOS | Internetworking Operating System (Cisco) | 互联网操作系统（Cisco） |
| IOS | Indian Ocean Station | 印度洋站 |
| IOS | Institute of Ocean Sciences | 海洋科学研究所 |
| IOS | Irish Over Seas | 爱尔兰海上 |
| IOS | Investment Opportunity Set | 投资机会集 |
| IOS | Inter-Operability Standard | 互操作性标准 |
| IOS | Infinity Optical Systems | 无限光学系统 |
| IOS | Intelligence Operations Specialist (US Federal Bureau of Investigation) | 情报行动专家（美国联邦调查局） |
| IOS | Integrated Observation System | 综合观测系统 |
| IOS | Integrated Operational Services | 综合运营服务 |
| IOS | Inventory Of Service | 服务清单 |
| IOS | Instructor Operating Station | 教员操作站 |
| IOS | Inter-Organizations Section | 组织间科 |
| IOS | Integrated Observing System | 综合观测系统 |
| IOS | Initial Operating Sector | 初始运营部门 |
| IOS | Is ook schitterend (Dutch band) | 荷兰乐队 |
| IOS | Intelligence Operations System (USMC replacement for TCO and IAS Suites) | 智能操作系统（USMC取代TCO和IAS套件） |
| IOS | Internal Order System | 内部订单系统 |
| IOS | Initial Operational System | 初始操作系统 |
| IOS | index of skewness | 偏度指数 |
| IOS | inferior occipital sulcus | 枕下沟 |
| IOS | interocclusal space | 咬合间隙 |
| IOS | International Online Soccer | 国际在线足球 |
| IOS | International Outsourcing Services | 国际外包服务 |
| IOS | Individual Ordinance Summary | 个人条例摘要 |
| IOS | Interorganizational System | 组织间系统 |
| IOS | International Officer School | 国际军官学校 |
| IOS | Integrated Operations Scenario | 综合运营方案 |
| IOS | Intermediate Open System | 中间开放系统 |
| IOS | International Operator Services (Sprint) | 国际运营商服务（Sprint） |
| IOS | Interim Operational Supplement | 临时作业补充 |
| IOS | Internal Opportunity System (Motorola) | 内部机会系统（摩托罗拉） |
| IOS | Inactive, Obsolete, Surplus (jobs) | 不活动、过时、过剩（工作） |
| IOS | International Online Soccer (gaming, Half-Life modification) | 国际在线足球（游戏，半条命修改） |
| IOS | Independent On Sunday | 星期日独立报 |
| IOS | Intranet Operating System | Intranet操作系统 |
| IOS | I'm Only Sleeping (Beatles song) | 我只能睡(披头士乐队歌曲) |
| IOS | Indian Ocean Tracking Station (AFSCN) | 印度洋跟踪站（AFSCN） |
| IOS | International Organization for Standards | 国际标准组织 |
| IOS | Interim Operational System | 临时作业系统 |
| IOS | Interconnected Operating System | 互连操作系统 |
| IOS | Instructor Operator Station | 教员操作员站 |