CIO

CIO may refer to:

Organizations[edit]

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)

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

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