IOS

• Cisco IOS, router and switch operating system
• iOS , an operating system for iPad, iPhone, iPod Touch, and Apple TV

Companies and organisations

• Illinois Ornithological Society, American state-based bird club
• Interorbital Systems, aerospace design firm in Mojave, California
• Interorganizational System, a supply chain management
• Investors Overseas Service, an investment company

Computing

• ios , a C++ header file
• IOS , Wii firmware
• Internet operating system, software which extends across the web
• International Online Soccer, a sports mod for Half-Life
• Input/Output Supervisor, a part of the IBM mainframe operating system control program

Geography

• Isles of Scilly, group of islands off Cornwall, UK
• Ios , Greek island

Media

• IOS Press, a Dutch scientific and medical publisher
• Independent on Sunday, a UK newspaper
• Ireland on Sunday, an Irish newspaper published from 1996 to 2006

Other

• Ilhéus Jorge Amado Airport, in Ilhéus, Brazil (IATA airport code).
• International Open Series, an amateur snooker tour
• International operator services, making an international call via a live telephone operator
• Instructor operating station, in flight simulators

See also

• IO