C98 or C-98 may refer to:
C-98 Clipper, the military designation of the Boeing 314 flying boat CJYC-FM, "Big John FM", formerly known as "C98" Cray C98, a model of the Cray C90 Ruy Lopez (ECO code), a chess opening Lake Village Airport (FAA LID), Indiana, US Right to Organise and Collective Bargaining Convention, 1949 (ILO code)