C79 or C-79 may refer to:
Junkers C-79, the US military designation of the Ju 52 transport aircraft Corydoras loxozonus, a freshwater catfish C79 optical sight, a small arms telescopic sight Ruy Lopez chess openings ECO code Secondary malignant neoplasm of other sites ICD-10 code Night Work of Young Persons (Non-Industrial Occupations) Convention, 1946 code Sun/C79, a 1974 song by Cat Stevens Caldwell 79, a globular cluster in the constellation Vela