MDA can refer to:

• Moldova (its ISO 3166-1 three-letter country code)
• MidAtlantic Airways
• MacDonald Dettwiler (formerly MacDonald, Dettwiler and Associates)
• Two organizations in the U.S.:
  • The Muscular Dystrophy Association
  • The Missile Defense Agency, an agency of the Department of Defense
• Various computing terms:
  • The OMG's Model-driven architecture
  • Monochrome Display Adapter, a computer display standard
  • Mail Delivery Agent
• 3,4-methylenedioxyamphetamine (MDA), a drug closely related to MDMA
• Malondialdehyde, the end product of lipid peroxidation.
• MDA is a television program produced by the Australian Broadcasting Corporation.
• Magen David Adom – the Red Cross of Israel
• Microconnect Distributed Antennae – local area GSM/GPRS connectivity
• Message Digest Algorithm:
  • MD2;
  • MD4;
  • MD5;
• MDA, formerly the Museum Documentation Association
• The T-Mobile MDA is a Windows-Mobile based PDA cellularphone
• The Mechatronics Design Association is a student run association at the University of Toronto

MDA | MDA | MDA | MDA | MDA