# C5

C5, C05, C V or C-5 may refer to:

## Military use

* Lockheed C-5 Galaxy, a military transport aircraft
* C-5 North Star, a 1940s Canadian military aircraft
* HMS C5, a 1906 Royal Navy C-class submarine
* USS C-5 (SS-16), a 1908 United States Navy C-class submarine
* USS San Francisco (C-5), an 1889 United States Navy protected cruiser
* Albatros C.V, a World War I German military reconnaissance aircraft
* AEG C.V, a World War I prototype German two-seat biplane reconnaissance aircraft
* DFW C.V, a World War I German military reconnaissance aircraft
* Fokker C.V, a 1924 Dutch light reconnaissance and bomber biplane aircraft
* Halberstadt C.V, a World War I German single-engined reconnaissance biplane
* Fokker C-5, an American military version of the Fokker F.VII aircraft
* SM UC-5, a 1915 German Type UC I U-boat
* C-5 (blimp), a United States Navy airship that attempted a trans-Atlantic flight in 1919

## Transport, vehicles, roads, public transport routes
### Road

* C5 automatic, a successor to Ford C4 transmission
* Chevrolet Corvette C5, the fifth generation of the Chevrolet Corvette sports car
* Citroën C5, a car manufactured by Citroën
* Omoda C5, a car manufactured by Chery
* Sauber C5, a sportscar by Sauber
* Audi A6 (C5), the second generation of the Audi A6 built from 1997 to 2004
* Sinclair C5, an electric vehicle designed by Clive Sinclair
* Circumferential Road 5 or C-5, an arterial road of Manila, Philippines

### Air travel and aircraft vehicles

* Kinner C-5, an American five cylinder radial engine for small aircraft of the 1930s
* Spartan C5, a passenger and utility aircraft produced in the United States in the early 1930s

### Rail

* Bavarian C V, an 1899 German express train locomotive model
* WLWR Class C5, a Waterford, Limerick and Western Railway Irish steam locomotive
* Finnish Steam Locomotive Class C5
* LNER Class C5, a class of British steam locomotives

### Other

* Crown C-5, a series of forklifts by the Crown Equipment Corporation
* Saturn C-5, an American man-rated expendable rocket

## Biology

* Cervical vertebra 5, one of the cervical vertebrae of the vertebral column
* Cervical spinal nerve 5
* Complement component 5, a protein of the complement system
** C5-convertase, an enzyme which splits C5 into C5b
** Complement component 5a, an inflammatory peptide
* ATC code C05 Vasoprotectives, a subgroup of the Anatomical Therapeutic Chemical Classification System
* C05, Malignant neoplasm of palate ICD-10 code

## Other uses

* C5 (classification), a Paralympic cycling classification
* C5 Envelope size
* C5, a decision tree learning algorithm
* C5 Generic Collection Library for C Sharp and CLI, a software library by Niels Kokholm and Peter Sestoft
* C5 line socket, a polarised, three pole, mains voltage IEC appliance connector
* ChorusOS, a computer operating system
* C5, CommutAir IATA code
* C5 or Tenor C, a musical note
* c5, a square of the chessboard using algebraic chess notation
* Microsoft Dynamics C5, enterprise resource planning software
* Channel 5 (disambiguation)
* Nokia C5 (disambiguation), a series of smartphones
* Caldwell 5 (IC 342), an intermediate spiral galaxy in Camelopardalis
* Concrete5, an open source content management system
* A line of earphones from Bowers & Wilkins
* Tha Carter V, a 2018 album by Lil Wayne
* Central 5, an informal political cooperation between Austria, the Czech Republic, Hungary, Slovakia, and Slovenia
* C$_5$, the cycle graph with 5 vertices