NMN

NMN may refer to:


 * National Monuments Council
 * Nicotinamide mononucleotide
 * Nigerian Merchant Navy
 * Numbered musical notation
 * "No middle name", sometimes used in legal documents for people with no middle name
 * NMN, the National Rail station code for New Mills Newtown railway station, Derbyshire, England
 * nmn, the ISO 639 code for the Taa language