CMN

CMN may refer to:


 * Canadian Museum of Nature, in Canada's National Capital Region
 * Carmarthen railway station, Wales, station code CMN
 * Catholic Media Network, Philippines radio network
 * Centre des monuments nationaux, French heritage agency
 * Certificate of medical necessity, in American healthcare
 * Children's Miracle Network Hospitals, in the U.S. and Canada
 * College of Menominee Nation, in Wisconsin, U.S.
 * Common Music Notation, open source musical notation software
 * Constructions Mécaniques de Normandie, a shipyard in Cherbourg, France
 * Mohammed V International Airport, Casablanca, Morocco, IATA code CMN
 * Mandarin Chinese, ISO 639-3 language code cmn