C22

C22 or C-22 or C.22 may refer to:
 * C-22 process, a photographic process
 * Boeing C-22, a military version of the Boeing 727-100/200
 * HMS C22, a 1909 British C-class submarine
 * Aérospatiale C.22, a French target drone
 * Sauber C22, a 2003 racing car
 * Caldwell 22 (NGC 7662, the Blue Snowball Nebula), a planetary nebula in the constellation Andromeda
 * Carbon-22 (C-22 or 22C), an isotope of carbon
 * Corydoras cochui, the barredtail corydoras, a freshwater catfish
 * Malignant neoplasms of liver and intrahepatic bile ducts ICD-10 code
 * Centre Municipal Airport FAA LID