C83 may refer to: Byron Airport, a public airport serving Contra Costa County, California, USA. Corydoras loxozonus, a freshwater catfish. Ruy Lopez chess openings ECO code Diffuse non-Hodgkin's lymphoma ICD-10 code HMS Southampton (C83), a 1934 British Royal Navy cruiser Labour Standards (Non-Metropolitan Territories) Convention, 1947 code Caldwell 83 (NGC 4945), a spiral galaxy in the constellation Centaurus C-83 may refer to : C-83 Coupe, an aircraft