C89

C89 may refer to:

Science and technology

• C89 (C version) or ANSI C, a C programming-language revision
• NGC 6087 (Caldwell catalogue: C89), an open cluster in the constellation Norma

Other uses

• Ruy Lopez (ECO code: C60–C99), a chess opening
• Night Work (Women) Convention (Revised), 1948, an ILO convention
• Sylvania Airport (FAA LID), Wisconsin, US

See also

• HMNZS Royalist (C89), a 1942 New Zealand Royal navy cruiser
• KNHC, a radio station in Seattle, Washington known as C89.5