MD

MD, Md or md may stand for:

Music

• Music director or musical director
• My December, an album by American pop rock singer-songwriter Kelly Clarkson
• Miles Davis, a jazz trumpeter, bandleader, and composer

Geography

• Maryland, United States postal abbreviations for American state
• Moldova, ISO country code and Internet top-level domain
• Magdeburg, a city in Germany
• Miami-Dade County, Florida, in the United States

Companies

• Managing director, term used for the chief executive of many companies
• McDonnell Douglas, formerly a major American aerospace manufacturer, now merged with Boeing
• Air Madagascar, IATA airline code
• MediaDefender, a company that tries to thwart P2P file sharing

Science

• Macular degeneration, a condition characterized by progressive thinning and atrophy of the macula area of the retina
• Mahalanobis distance in statistics
• Mendelevium (Md), symbol for the synthetic chemical element
• millidarcy (mD), one thousandth of a darcy, a unit of fluid permeability
• Molecular dynamics, a form of computer simulation where atoms and molecules are allowed to interact for a period of time under known laws of physics
• Muscular dystrophy, genetic and hereditary muscle disease
• Myotonic dystrophy, a type of muscular dystrophy
• Medial dorsal nucleus
• Mesoscale discussions produced by the United States Storm Prediction Center

Computing

• Sega Mega Drive, a 16-bit console by Sega
• Microdrive, the term for a small hard drive designed to interoperate with CompactFlash
• MiniDisc, a magneto-optical data storage device initially intended for storage of up to 80 minutes of digitised audio
• MonoDevelop
• Message digest, a cryptographic hash function
• md, the Linux multiple disk software RAID driver
• md or mkdir, a DOS command that makes a directory

Miscellaneous

• Doctor of Medicine, from the Latin Medicinæ Doctor (MD)

• Muscular Development, a bodybuilding magazine
• Muhamma (name), "Md." is often used as a shortened version of the name
• Mountain Dew, a soda
• Main Deck in Magic: The Gathering cards
• Muhan Dojeon or Infinite Challenge, a South Korean comic-variety TV programme
• Metropolitan Division, a subdivision of a United States metropolitan area, a geographic statistical area

Main dike