C93 may refer to: C93 (Netherlands Antilles), a political party Ruy Lopez, Smyslov Variation chess openings ECO code C93FM, a Christchurch-based New Zealand radio Monocytic leukemia ICD-10 code Wages, Hours of Work and Manning (Sea) Convention (Revised), 1949 code C-93 Conestoga, a World War II American military aircraft Borchardt C-93, an 1893 pistol Current 93, an English experimental music band C93, a civilian version of the HK93 semi-automatic rifle