CIO may refer to: Organizations. Governmental organizations. Central Imagery Office, an office of the US Department of Defense that was a predecessor of the National Geospatial-Intelligence Agency. Central Intelligence Office, the national intelligence agency of the former South Vietnam. Central Intelligence Organisation, the national intelligence agency of Zimbabwe. Corruption Investigation Office for High-ranking Officials, a government agency of South Korea. Non-governmental organizations. Centro de Investigaciones en Optica, a Mexican research centre in optics.
https://en.wikipedia.org/wiki/CIO