Co

The abbreviation Co or CO may refer to several articles in Wikipedia:

• chemical symbol for Cobalt (Co)
• chemical symbol for Carbon monoxide (CO)
• ISO 3166-1 code for Colombia
• the U.S. postal abbreviation for Colorado
• IATA airline code for Continental Airlines
• Company
• Commanding Officer, in the military
• Central office, in telecommunications and telephony
• Co is the UIC classification for the railroad locomotive wheel arrangement known as 0-6-0 in the Whyte notation; a locomotive with three powered axles (and thus six wheels) in which the axles are independently powered (e.g. by separate traction motors)

Co is also a gender-neutral pronoun.