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SMN may refer to:

  • Lemhi County Airport, IATA airport code of SMN
  • Netherland Line or Semper Mare Navigandum
  • 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
  • Survival of motor neuron protein, a protein complex