C88 may refer to:
Ruy Lopez chess openings ECO code Immunoproliferative disorders ICD-10 code Employment Service Convention, 1948 code Porsche C88 prototype car for the Chinese market, 1994 Caldwell 88 (NGC 5823), an open cluster in the constellations Circinus and Lupus Form C88, a European Union customs declaration form An early version of the programming language standard ANSI C
See also C8 (disambiguation)