CDO is an abbreviation used in several separate fields.

Locations[link]

• Cagayan de Oro, a city that lies along the northern coastline of Mindanao Island, Philippines
• Canyon del Oro High School, a public school in Oro Valley, Arizona, USA
• Cañada del Oro, a primary watershed channel in the valley of Tucson, Arizona, USA

Computer science[link]

• Collaboration Data Objects, a Microsoft application programming interface for data access
• Connected Data Objects, a free implementation of a Distributed Shared Model on top of the Eclipse Modeling Framework

Job titles[link]

• Chief Data Officer, an information systems title
• Chief Dental Officer (Canada), a Canadian official who advises the public and federal government on oral health
• Chief Dental Officer (United Kingdom) for England, the British government's most senior advisor for dentistry
• Chief Development Officer, a business position

Chemistry[link]

• Cysteine dioxygenase, an enzyme
• Chlordiazepoxide, by the trade name "CDO"

Other[link]

• Central dense overcast, in a tropical storm
• Collateralized debt obligation, a structured finance product
• Continuous Duty Overnight, a regional airline crew scheduling term
• Min Dong, the ISO-639 code for the spoken variation of the Chinese language

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