MMD
MMD stands for:
- Merchant Mariner's Document , American ID card for civil seafarers according to the Seafarers' Identity Documents Convention of the UN International Labor Organization
- Movement for Multi-Party Democracy , political party in Zambia
- Multimedia socket , an antenna socket with a socket for a cable modem
- Minami-Daito Airport (IATA code), Minamidaitō Airport , Shimajiri-gun (Okinawa) , Okinawa Prefecture , Japan
- Air Alsie (ICAO code), Danish airline
- Lübeck Air (ICAO code), German virtual airline that shares the ICAO code with Air Alsie
- Roman numerals for 2500
mmd stands for:
- Maonan (language) (ISO-639-3 code), Tai Kadai language of the Maonan
