ISO may refer to:
- International Organization for Standardization, an international standard-setting body
- 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
- 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)
- Intense Suicide Observation, a suicide watch in which the subject is constantly monitored at all times
- Kinston Regional Jetport, IATA code ISO
- "In Search Of", Online jargon
- Inside-out roll, a type of sushi roll with the rice on the outside of the nori, Japanese name Uramaki.
- I.S.O., an EAI-band from Japan, with Yoshihide Otomo, Sachiko M and Yoshimitsu Ichiraku as musicians.
- Iso (album), an album by Ismaël Lô.
Iso may also refer to:
iso- is a prefix from the Greek isos, meaning "equal." It is used primarily in scientific and technical terms, such as isometric, isotonic, and isonomic.
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