C6

C6, C06, C VI or C-6 may refer to:

Road

 * Chevrolet Corvette C6, a 2005 sports car
 * Cierva C.6, a 1924 Spanish autogyro
 * Citroën C6, a 2005 executive car
 * Sauber SHS C6, a 1982 Group C prototype racing car
 * Ford C6 transmission, a heavy-duty automatic transmission built by Ford Motor Company

Air

 * AEG C.VI, a German World War I reconnaissance aircraft
 * DFW C.VI, a 1916 German reconnaissance aircraft
 * LVG C.VI, a 1917 German twin-seat reconnaissance aircraft
 * C-6 Ute, a military version of the Beechcraft King Air airplane

Rail

 * Bavarian C VI, an 1899 German steam locomotive model
 * LNER Class C6, a class of British 3-cylinder compound locomotives

Water

 * C-6, United States Army designation of the Sikorsky S-38 amphibious flying boat
 * HMS C6, a 1906 British Royal Navy submarine
 * USS Olympia (C-6), a 1892 United States Navy protected cruiser

Anatomy and medicine

 * Complement component 6 (C6 protein) in the complement cascade system of immune proteins (native immunity)
 * Cervical vertebra 6, one of the cervical vertebrae of the vertebral column
 * Cervical spinal nerve 6 (C6), a spinal nerve of the cervical segment

Other uses

 * C6 (explosive), a form of plastic explosive
 * C-6 Canal, a canal that flows from Lake Okeechobee in Florida to its terminus at the Miami River
 * C6 connector, an electrical power connector
 * Circumferential Road 6 or C-6, an arterial road of Manila, Philippines
 * Benzotriyne, a hypothetical chemical compound with molecular formula C6
 * CanJet (IATA code C6), former air carrier
 * Soprano C, a musical note designated C6
 * C6 GPMG, Canadian designation of the FN MAG machine gun
 * C6 tuning, a common tuning of a steel guitar (the musical chord of C6)