11C

11C, 11-C or 11.C may refer to:


 * New York State Route 11C
 * GCR Class 11C, a class of British 4-4-0 steam locomotive
 * 11C, a U.S. Army MOS for a mortarman
 * The clockwise bus service on West Midlands bus route 11
 * Carbon-11 (11C), an isotope of carbon