may refer to:
- International Organization For Standardization , an international standard-setting body
- --- List Of ISO Standards including:
-- , for film speeds
-- ISO 9000 , for quality management systems
-- ISO Image (.iso), is a disk image of an ISO 9660 file system
- Infrared Space Observatory , a space telescope designed and operated by the European Space Agency
- Incentive Stock Option
- Imperial Service Order , an award in the British honours system
- Kinston Regional Jetport , IATA code ISO
- Independent System Operator , an organization that coordinates a regional wholesale electricity market in the United States
- International Science Olympiad , a group of worldwide annual competitions
- Indianapolis Symphony Orchestra
- Independent Sales Organization , administers merchant and/or cardholder servicing
- International Sugar Organization , devoted to improving conditions on the world's sugar market
- Insurance Services Office , in the United States
- International Socialist Organization , which is active in the United States
- International Socialist Organisation (Australia)
may also refer to:
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