Ios or IOS may refer to:
- Illinois Ornithological Society, American state-based bird club
- Ios Island, a Greek island in the Cyclades group in the Aegean Sea
- IOS Press, a Dutch publisher of scientific and medical research titles
- Internet operating system, software containing sets of procedures and functions providing the framework for the high-level implementation and operation of Internet based applications in a uniform manner
- Cisco IOS (originally Internetwork Operating System), the operating system used on Cisco Systems routers and some network switches
- The Investors Overseas Service, an investment company
- The Independent on Sunday, a UK newspaper
- ios (C++), a C++ header file
- Integral Operating System, the information 'software' associated with indexing an integral (i.e. Ken Wilber's) perspective.
- Integrated Operating Solutions, a Miami based document management and EMR company
- Interorbital Systems, a private aerospace design firm located in Mojave, California
- International Online Soccer, a sports mod for Half-Life.
- Input/Output Subsystem, a component of the MVS element of z/OS (f/k/a OS/390) that provides the low level input and output interfaces for the operating system.
- Isles of Scilly, the group of islands off of Cornwall, UK
- Impulse oscillometry - technique to assess airflow obstruction in patients who are not able to perform forced breathing maneuvers, e.g., subjects with diaphramatic rupture, cerebral palsy or severe mental retardation, and young children.
- International Operator Services - Operator-Services Collect or credit card calling using a live operator to connect calls from anywhere to anywhere using a credit card or reverse charges to pay for it.
- The firmware that runs on the Starlet coprocessor used in the Wii video game console (See Wii System Software).
- Interorganizational System
- 'iOS' - An informal name for Apple iPhone OS.
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