# MSD

MSD may refer to:

## People

* Mahendra Singh Dhoni or MSD (born 1981), Indian cricketer

## Companies

* Merck Sharp and Dohme, an international name of Merck & Co., the U.S. and Canada pharmaceutical company formerly related to German Merck KGaA
* MSD Capital, a private investment firm owned by personal computer entrepreneur Michael Dell
* MSD Ignition, a company that specializes in automotive-ignition components; MSD stands for "multiple spark discharge"
* Motor Sports Developments, an automotive-engineering company based in Milton Keynes, United Kingdom; see X25XE

## Computers

* Mass storage device, like a USB key
* Memory Stick Duo, a type of solid digital data storage device
* Microsoft Diagnostics, a computer diagnostic program shipped with various versions of DOS and Microsoft Windows operating systems
* Modem Sharing Device
* MSD Super Disk, a floppy-disk drive for Commodore 8-bit systems
* miniSD/microSD

## Organizations
### Schools and school districts

* Marjory Stoneman Douglas High School, Florida, United States
** Stoneman Douglas High School shooting
* Marshall School District in Marshall, Arkansas, United States
* Maryland School for the Deaf, United States
* Milford School District, a school district in Milford, Delaware, United States
* Missouri School for the Deaf
* Moscow School District in Moscow, Idaho, United States

### Other organizations

* Meclîsa Sûriya Demokratîk or Syrian Democratic Council, the political wing of the Syrian Democratic Forces in Syria
* Metro de Santo Domingo, a rapid-transit system in Santo Domingo, the capital of the Dominican Republic
* Ministry of Social Development (New Zealand)
* Mission Science Division, a group of scientists, research fellows and young graduates working at the European Space Agency
* Mladí sociální demokraté or Young Social Democrats (Czech Republic), a social democratic youth organization in the Czech Republic
* Mladí sociálni demokrati or Young Social Democrats (Slovakia), a social democratic youth organization in Slovakia
* Mobile Security Deployments, the U.S. Diplomatic Security Service's tactical unit
* MSD (Межправительственный совет дорожников) or Intergovernmental Council of Roads, the road authority organisation of the Commonwealth of Independent States

## Science and medicine

* Macromolecular Structure Database, one of the services provided by the European Bioinformatics Institute
* Major hypersomnolence disorder
* Marine sanitation device, used in the Regulation of ship pollution in the United States#Marine sanitation devices
* Mars solar date
* Mass spectrometric detector, a type of chromatography detector
* Mean squared displacement, a statistical measure of random motion
* Mean signed deviation, a measure of statistical deviation
* Multiple sulfatase deficiency, a very rare form of metachromatic leukodystrophy
* Musculoskeletal disorders

## Other uses

* Magnetic switchable device, a passive magnetic mount that can be activated or deactivated
* Master Scuba Diver, a certification level in recreational scuba diving
* Master of Science in Dentistry, a Dental degree
* Master of Sport Directorship (MSD) at Manchester Metropolitan University
* Mean Shortest Distance, in the context of the PGP Web of trust
* Minimum string distance, the number of insertions, deletions, or substitutions to transform one string into another in Typing#Minimum string distance error rate
* Moorside railway station, England National Rail station code
* Moscow Summer Time
* Most significant digit