The International Organization for Standardization (ISO) is an international nongovernmental organization made up of national standards bodies; it develops and publishes a wide range of proprietary, industrial, and commercial standards and is comprised of representatives from various national standards organizations.

The organization's abbreviated name—ISO—is not an acronym; it derives from the ancient Greek word ísos, meaning equal or equivalent. Because the organization would have different acronyms in different languages, the founders of the organization decided to call it by the short form ISO.