C97

C97 may refer to:
 * Ruy Lopez chess openings ECO code
 * Malignant neoplasms of independent (primary) multiple sites ICD-10 code
 * Lowell Airport (Indiana), in Indiana FAA LID
 * Migration for Employment Convention (Revised), 1949 ILO code

C-97 may refer to:
 * C-97 Stratofreighter, an aircraft