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MD, Md, mD or md may refer to:

Arts and media[edit]


  • Main droite or mano destra (MD or m.d.), used in piano scores to mark sequences of notes that are to be played with the right hand
  • MiniDisc, an optical storage medium developed by Sony
  • Music director; the term "MD" is used particularly in musical theatre


  • Maryland (US postal abbreviation MD)
  • Moldova (ISO country code MD)
  • Magdeburg (vehicle plate prefix), a city in Germany
  • Metropolitan division, a territory unit defined by the US Office of Management and Budget as a county or group of counties within a metropolitan statistical area

Science and technology[edit]

Biology and medicine[edit]


  • .md, Internet top-level domain for Moldova
  • mkdir or md, an operating system command to create a directory
  • Markdown (file extension .md), a format
  • Message-digest algorithm, a cryptographic hashing function
  • Microdrive, a type of miniature hard drive
  • mdadm (multiple device), a device driver used to support RAID in the Linux kernel


Other uses[edit]

See also[edit]