CIO
# CIO

CIO may refer to:

## Organizations

* Central Imagery Office, a predecessor of the American National Geospatial-Intelligence Agency
* Central Intelligence Office, the national intelligence agency of the former Republic of Vietnam
* Central Intelligence Organisation, the national intelligence agency of Zimbabwe
* Centro de Investigaciones en Optica, a Mexican research center in optics
* Charitable incorporated organisation, a form of legal entity for non-profits in the United Kingdom
* Congress of Industrial Organizations, a former American trade union federation (at first named the Committee of Industrial Organization)
* Corruption Investigation Office for High-ranking Officials, a government agency of South Korea
* Credit and Investments Ombudsman, an Australian dispute resolution service
* International Olympic Committee (French: Comité International Olympique)

## Titles

* Chairman-in-Office, is an official of a member state holding the presidency of an international organization
* Chief information officer, the head of information technology
* Chief innovation officer, the head of innovation, responsible for innovation management
* Chief investment officer, the head of investments
* Commonwealth Chairperson-in-Office, the Chairperson-in-Office of the Commonwealth of Nations

## Other uses

* Charitable Incorporated Organisation, a legal form of business in the United Kingdom
* CIO magazine, both print and online
* Concurrent input/output, a feature in the JFS file system
* Conventional International Origin, a conventionally defined reference axis of the pole's average location
* "Cry it out", an aspect of the Ferber method for solving childhood sleep problems
* City One station, Hong Kong, MTR station code
