SMN

SMN may refer to:


 * Lemhi County Airport, IATA airport code of SMN
 * Netherland Line (Stoomvaart Maatschappij Nederland)
 * Seri Maharaja Mangku Negara, a Malaysian honour
 * S-m-n theorem, a computability theorem regarding programming languages
 * Servicio Meteorológico Nacional (Mexico), Mexico's National Meteorological Service
 * Servicio Militar Nacional, Mexico's National Military Service
 * Société Métallurgique de Normandie, a steel mill in Caen, Normandy, France
 * Stathmin protein
 * Satellite Music Networks, a US radio network
 * Inari Sámi language, ISO language code of SMN
 * Survival of motor neuron protein, a protein complex
 * Shawnee Mission North, a high school in the Shawnee Mission School District in Kansas