C13

C13 or C-13 may refer to:
 * French Defence, Encyclopaedia of Chess Openings code
 * C13 White Lead (Painting) Convention, 1921
 * C13 grenade, the Canadian Forces designation for a M67 grenade
 * Autovia C-13, a highway in Catalonia in Spain
 * Caterpillar C13 Engine, an engine by Caterpillar Inc.
 * HMS C13, a 1906 British C-class submarine
 * IEC 60320 C13, a polarised, three pole plug used in electric power cables
 * LNER Class C13, a 4-4-2T steam locomotive class of 1907, built for suburban passenger services around London
 * OTO Melara C13
 * Sauber C13, a 1994 racing car
 * Caldwell 13 (NGC 457, the Owl Cluster or ET Cluster), an open star cluster in the constellation Cassiopeia
 * The 13th century
 * in music, a chord with the structure 1 - 3 - 5 - b7 - 9 - 13
 * Carbon-13, a natural stable isotope of carbon
 * Malignant neoplasm of hypopharynx ICD-10 code
 * C13/C14 Coupler, a class of cable connector used by most desktop computers