C12

C12, C.XII or C-12 may be:
* C12 Workmen's Compensation (Agriculture) Convention, 1921
* C-12 "Huron", a logistics support aircraft of the U.S. Military (military versions of the Beechcraft Super King Air)
* C-12 "Vega", an early transport of the United States Army Air Corps
* Albatros C.XII, a World War I German military reconnaissance aircraft
* Autovia C-12, a highway in Catalonia, Spain
* Cierva C.12, a 1927 British experimental autogyro
* HMS "C12", a British C class submarine of the Royal Navy
* Sauber C12, a 1993 racing car
* Spyker C12 Zagato, a 2008 Dutch car
* USS "Columbia" (C-12), a light cruiser of the United States Navyand also :
* Carbon-12, the most abundant stable isotope of carbon
* Malignant neoplasm of piriform sinus ICD-10 code