MDN

MDN may refer to:

Computing and technology

 * MDN Web Docs (formerly Mozilla Developer Network), a Mozilla website for developer documentation
 * Message Disposition Notification, a form of return receipt for e-mail
 * Telephone number for mobile devices, as in:
 * Mobile device number
 * Mobile dialable number
 * Mobile directory number

Organizations

 * Ministry of National Defence (Portugal) (Ministério da Defesa Nacional), the Portuguese defence ministry
 * Nicaraguan Democratic Movement (Movimiento Demócratico Nicaragüense)

Transport

 * Macedon railway station, Victoria, Australia (station code: MDN)
 * Madison Municipal Airport (Indiana), Madison, Indiana, United States (IATA code: MDN)
 * Maiden Newton railway station, England (National Rail station code: MDN)
 * Medan railway station, North Sumatra, Indonesia (station code: MDN)
 * Meriden (Amtrak station), Connecticut, United States (Amtrak station code: MDN)
 * Minggang East railway station, China (China Railway telegraph code: MDN)
 * Morden tube station (London Underground station code: MDN)
 * Mudan Airlines, Somali Republic (ICAO code: MDN)

Other uses

 * East German mark (Mark der Deutschen Notenbank), the official unit of currency in East Germany from 1964 to 1967
 * Maya Day Number, the sum of days in Mesoamerican Long Count calendar
 * Mbati language (ISO 639-3: mdn)
 * MdN Interactive, the magazine for Macintosh designers Network
 * MDN, a television station in Griffith, New South Wales, and sister station of MTN