MDD
# MDD

MDD may refer to:

* Major depressive disorder, a mental disorder involving persistent low mood, low self-esteem and loss of interest. It is also known as clinical depression.
* Mate-Demate Device, a specialized crane used to piggyback the Space Shuttle onto an airplane
* Medical Devices Directive
* Midland Airpark (IATA: MDD), a public use airport in Midland, Texas
* Mine detection dogs
* Ministry of Defence (Italy), known natively as Ministero della Difesa
* Mirrored Drive Door, a case design for the Power Mac G4
* Model-driven development, a software engineering discipline
