| IOS | i Operating System 
| Others |
| IOS | Identified Orbiting Satellite
| Others |
| IOS | iDevice Operating System
| Others |
| IOS | Ikea Of Sweden
| Others |
| IOS | Ilheus, Buenos Aires, Brazil
| Others |
| IOS | Ilheus/Bahia-Jorge Amado Airport
| Others |
| IOS | Incompatible Operating System
| Others |
| IOS | Independent On Sunday
| Others |
| IOS | Indian Ocean Ship, Spaceflight Tracking Data network station
| Others |
| IOS | Indian Ocean Station
| Others |
| IOS | Indian Orthodontic Society
| Others |
| IOS | Indian OverSeas
| Others |
| IOS | Individual Ordinance Summary
| Others |
| IOS | Infancy Operating System
| Others |
| IOS | Inferior Operating System
| Others |
| IOS | Information Organization System
| Others |
| IOS | Information Overload Syndrome
| Others |
| IOS | Informational Operating System
| Others |
| IOS | Input Output Stable
| Others |
| IOS | Input Output Subsystem
| Others |
| IOS | Input Output Supervisor
| Others |
| IOS | Input Output System
| Others |
| IOS | Input/Output Supervision
| Others |
| IOS | Input/Output Supervisor
| Others |
| IOS | Input/Output System
| Others |
| IOS | Inside Our Souls
| Others |
| IOS | Inspection Operation Sheet
| Others |
| IOS | Inspection Operation System
| Others |
| IOS | Institute of Ocean Sciences
| Others |
| IOS | Institute of Oceanographic Sciences
| Others |
| IOS | Institute Of Science
| Others |
| IOS | Institute Of Sociology
| Others |
| IOS | Institute Of Swimming
| Others |
| IOS | Instructor Operating System
| Others |
| IOS | Instructor Operator Station
| Others |
| IOS | Integrative Organismal Systems
| Others |
| IOS | Intel Online Services
| Others |
| IOS | Intellegent Operating System
| Others |
| IOS | Intelligent Operating Software
| Others |
| IOS | Intelligent Operating System
| Others |
| IOS | interactive Open SUSE
| Others |
| IOS | Interconnected Operating System
| Others |
| IOS | Intermediate Open System
| Others |
| IOS | Internal Operating System
| Others |
| IOS | Internal Overflow System
| Others |
| IOS | International Online Soccer
| Others |
| IOS | International Outsourcing Services
| Others |
| IOS | Internet of Services
| Others |
| IOS | Internet Of Shopping
| Others |
| IOS | Internet Of Space
| Others |
| IOS | Internet Of Systems
| Others |
| IOS | Internet Operating System
| Others |
| IOS | Internet Over Satellite
| Others |
| IOS | Internetwork Operating System
| Others |
| IOS | Internetworking Operating System
| Others |
| IOS | Interweb Opinion Stool
| Others |
| IOS | Investment Opportunity Set
| Others |
| IOS | Investors Overseas Services
| Others |
| IOS | iPhone Operating Sysstem
| Others |
| iOS | iPhone Operating System
| Others |
| iOS | iPhone Operating Sytem
| Others |
| IOS | Iphone Operation System
| Others |
| IOS | iPhone OS (formerly)
| Operating System |
| IOS | iPhone/iPad Operating System
| Others |
| IOS | iProducts Operating System
| Others |
| IOS | Irish OverSeas
| Others |
| IOS | Is a Operating System
| Others |
| IOS | Is Only Science
| Others |
| IOS | Is The Operating System
| Others |
| IOS | Isuzu Outlet Standardization
| Others |
| IOS | It's Our Secret
| Others |
| IOS | The International Organization For Standards
| Others |