FMN

FMN may refer to:


 * Federated Mission Networking
 * Facial motor nucleus
 * Flavin mononucleotide
 * Flour Mills of Nigeria, a Nigerian agribusiness company
 * FMN (TV channel), Indonesia
 * Formins
 * The FAA LID/IATA code for Four Corners Regional Airport in Farmington, New Mexico, United States
 * Ministry of Defence (Denmark) (Danish: Forsvarsministeriet)
 * Narrowband FM, or frequency modulation narrow