C5

C5 or C-5 may refer to:


 * C5 is the envelope size matching the A5 paper size
 * C5 Generic Collection Library for C Sharp and CLI, a software library by Niels Kokholm and Peter Sestoft
 * C5.0, a data mining tool for discovering patterns in extensive databases
 * C-5 Galaxy, a transport aircraft from Lockheed
 * Champlain Enterprises airline IATA code
 * CommutAir IATA code
 * Citroën C5, a brand of car manufactured by Citroën
 * Corvette C5, the fifth generation of the Chevrolet Corvette sports car
 * ChorusOS computer operating system
 * Fifth cervical vertebra of the vertebral column, in human anatomy
 * HMS C5, a British C-class submarine of the Royal Navy
 * Sinclair C5, an electric moped designed by Clive Sinclair
 * Tenor C is also known as C5
 * The Audi A6 car built from 1997-2004.
 * USS C-5, a C class submarine of the United States Navy
 * USS San Francisco (C-5), a protected cruiser of the United States Navy
 * Yamaha C5 grand piano
 * Complement component 5, an inactive complement protein of the complement system. It can be split by C5-convertase into C5a, an inflammatory peptide, and C5b
 * A polarised, three pole, mains voltage IEC connector
 * C5 corporation art collective


 * C.V, a German designation for several World War I armed reconnaissance aircraft:
 * AEG C.V
 * DFW C.V

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