Cao or CAO may refer to:
Mythology
- Cao (bull), a legendary bull in Meitei mythology
 
Companies or organizations
- Air China Cargo, ICAO airline designator CAO
 - CA Oradea, Romanian football club
 - CA Osasuna, Spanish football club
 - Canadian Association of Orthodontists
 - Central Allocation Office, cross border electricity transmission capacity auction office
 - Central Applications Office, Irish organisation that oversees college applications
 - Civil Aviation Office of Poland
 - Iran Civil Aviation Organization
 - Office of the Chief Administrative Officer of the United States House of Representatives
 - Compliance Advisor/Ombudsman, accountability arm of the World Bank
 - Council for Adult Education, later Centre for Adult Education, in Victoria, Australia
 
Job titles
- Chief Academic Officer of a University, often titled the Provost
 - Chief accounting officer of a company
 - Chief administrative officer of a company
 - Chief analytics officer of a company
 - Compliance Advisor/Ombudsman, an independent office that reviews complaints
 
Names
People
- Cao (footballer, born 1968), Portuguese footballer
 - Cao Cao (died 220), founder of Cao Wei, China
 - Cao Hamburger (born 1962), Brazilian director, screenwriter and producer
 - Cao Pi (c.187–226), emperor of Cao Wei, China
 - Cao Yu (1910–1996), Chinese playwright
 - Cao Yupeng (born 1990), Chinese snooker player
 - Diogo Cão, a 15th-century Portuguese explorer
 - Joseph Cao (born 1967), United States politician
 - Lady of Cao, a Moche mummy, Peru
 - Longbing Cao (born 1969), data scientist
 
Places
- Cao (state), a Chinese vassal state of the Zhou Dynasty (1046 - 221 BCE)
 - Cao County, Shandong, China
 - Cao Wei, also called Wei, one of the regimes that competed for control of China during the Three Kingdoms period (220 - 280 CE)
 
Other uses
- CaO, the chemical symbol for calcium oxide
 - Cão!, an album by Portuguese band Ornatos Violeta
 - CA Osasuna, a Spanish sport club
 - a Child Arrangement Order under English family law
 - Chlorophyllide-a oxygenase, an enzyme
 - Cold air outbreak, an intense and/or prolonged cold weather wave of air
 - Controller Access Object, as described in the ORiN robot interface
 
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