MD, Md, mD or md may refer to:
The MD Helicopters MD 500 series is an American family of light utility civilian and military helicopters.
MDNA is the twelfth studio album by American singer and songwriter Madonna. It was released on March 23, 2012, by Interscope Records.
The MD5 algorithm is a widely used hash function producing a 128-bit hash value. Although MD5 was initially designed to be used as a cryptographic hash function, it has been found to suffer from extensive vulnerabilities.
MDK is a 1997 third-person shooter video game developed by Shiny Entertainment for Microsoft Windows. It was ported to Mac OS by Shokwave, and to the PlayStation by Neversoft.
MDK2 is a 2000 third-person shooter, action-adventure video game developed by BioWare and published by Interplay Entertainment for the Dreamcast, Windows and PlayStation 2. It is a sequel to the 1997 game MDK.
MDC (Millions of Dead Cops) is an American punk rock band formed in Austin, Texas in 1979. The band was subsequently based in San Francisco, California, and are currently based in Portland, Oregon.