CUO may refer to:
- CuO - Copper(II) oxide
- COU is the ICAO airline designator for Aerocuahonte, Mexico
- Columbia University Orchestra, United States
- Centre for Usability Research (Centrum voor Usability Onderzoek), Belgium
- Compaq Users Organisation
- Cadet Under Officer in the Australian Army Cadets
- Cadet Under Officer in the Australian Air Force Cadets
Refer also:
- King Cuo of Zhongshan
CUO-abbreviation of Chief Underwriting Officer used in insurance company or top underwriting occupation of an insurance company