C15

C15 or C.XV may refer to:

• Albatros C.XV, a 1918 German military reconnaissance aircraft
• BSA C15, a unit-construction motorcycle manufactured by the Birmingham Small Arms Company between 1959 and 1967
• Coronado C15, a sailboat
• HMS C15, a 1908 British C-class submarine
• Sauber C15, a 1996 racing car
• Citroën C15, a light van
• IEC 60320 C15, a power connector
• The 15th century (1401–1500)
• McDonnell Douglas YC-15
• Esophageal cancer ICD-10 code
• Carbon-15 (C-15 or ¹⁵C), an isotope of carbon
• Caldwell 15 (NGC 6826), a planetary nebula in the constellation Cygnus
• A 15-minute Cassette tape, often used to store computer games
• A synthetic chemerin-derived peptide
• The fatty acid pentadecylic acid, whose lipid numbers are C15:0