ISO (disambiguation)

ISO may refer to:

* International Organization for Standardization, an international standard-setting body
** List of ISO standards including:
*** ISO 5800:1987, for Film speed (or ISO speed)
*** 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
* 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:

* Isoprenaline, an adrenergic agonist
* Iso (record label), created by David Bowie after he left Virgin Records
* Iso Rivolta, Italian car brand that went bankrupt in 1974
* ISO image, a file format (.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.