C90 or C-90 may refer to:

• Multiple myeloma and malignant plasma cell neoplasms (ICD-10 code)
• Caldwell 90 (NGC 2867), a planetary nebula in the constellation Carina
• C₉₀, the conventional electrical unit for the coulomb
• C90 audio cassette, a blank audio cassette in the very popular 90 (2 x 45) minute length

• Cray C90, a supercomputer
• C90 (C version), a standardized ISO C form of the C programming language, virtually the same as the ANSI C ("C89") standard

• Beechcraft C90 King Air, an aircraft
• Continental C90, an aircraft engine
• Honda Super Cub, an underbone motorcycle designated C90 in a 90 cc version
• Chicago terminal radar approach control, (FAA designation C90); See Air traffic control

• C90-CR (M3), a rocket launcher
• Ruy Lopez chess openings (ECO code)

Topics referred to by the same term

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