CUO may refer to:

• Company Under Officer, a military appointment in some Commonwealth countires.

• CuO - Copper(II) oxide

• COU is the ICAO airline designator for Aerocuahonte, Mexico

• Compaq Users Organisation

• Cadet Under Officer senior cadet rank in some youth cadet forces

• King Cuo of Zhongshan

• Chief Underwriting Officer used in insurance company or top underwriting occupation of an insurance company

See also