CO or variants may refer to:
Chemistry
- Carbon monoxide (CO), a colorless, odorless, and tasteless gas
- Carbonyl group, composed of a carbon atom double-bonded to an oxygen atom: C=O
- Cobalt, a chemical element, symbol Co
Computing and telecommunications
- .co (second-level domain), the Internet second-level domain meaning "commercial"
- .co, the Internet country code top-level domain (ccTLD) for Colombia
- Commitment ordering (CO), a concurrency control technique for databases
- Telephone exchange, or central office (CO)
Mathematics
- Cofunction, or Co, in trigonometry
- Cuboctahedron, a uniform polyhedron
People
- Nguyễn Hữu Có (1925–2012), Vietnamese general
- Conrado Co (born 1940), Filipino badminton player
- Alfredo Co (born 1949), Filipino Sinologist
- Atoy Co (born 1951), Filipino actor and basketball coach
- Leonard Co (1953–2010), Filipino botanist
- Nando Có (born 1973), Bissau-Guinean footballer
- Kenedy Có (born 1998), Bissau-Guinean footballer
- Samuel S. Co, Filipino politician
Places
- CO postcode area, or Colchester postcode area, England
- Colombia, ISO 3166-1 country code CO
- Colorado, United States postal abbreviation CO
- Counties of Ireland, abbreviated Co.
Ranks and titles
- C.O., post-nominal initials of members of the congregation of the Oratory of Saint Philip Neri
- C/O, cadet officer ranks of the Junior Reserve Officers' Training Corps
- Commanding officer (CO), the officer in command of a military unit
- Contracting Officer (CO or KO), in the U.S. government
- Correctional officer (CO), an officer whose duty it is to safeguard and promote the welfare of inmates
- Circle officer (CO), in the Indian government
- Conscientious objector
Transportation
- Chemins de fer Orientaux (CO), a former Ottoman railway company
- Chesapeake and Ohio Railway (C&O or CO), a former American railroad
- Cobalt Air (IATA airline designator CO, 2016-2018), a Cypriot airline
- Continental Airlines (IATA airline designator CO, 1937-2012), an American airline
Other uses
- co-, an English prefix meaning coming together
- Cardiac output (CO), the volume of blood being pumped by the heart per time unit
- Castres Olympique, a French rugby club
- Certificate of occupancy (CO), a legal document
- Certificate of origin (often abbreviated to C/O or CoO), in international trade
- Company, abbreviated co.
- Corsican language, ISO 639-1 language code co
- ℅, a Unicode character in the Letterlike Symbols block
- c/o, former name of Gerhardsen Gerner, an art gallery in Berlin
See also
- C0 (disambiguation), the letter–number combination
- Care of (disambiguation)
- Co-Co locomotives
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