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