DM

• Doctor of Management, an academic management degree
• Doctor of Medicine, commonly known as M.D. but archaically abbreviated as D.M.
• Doctor of Music, an academic music-performance degree, also known as DMA

Broadcasting

• Danger Mouse (TV series), a British animated television series
• WWDM, a radio station licensed to Sumter, South Carolina, United States

Gaming

• Deathmatch (video games), a gameplay mode integrated into first-person shooter computer games
• Dungeon Master, the game designer, storyteller and referee in Dungeons & Dragons

Music

• D minor, a minor scale or chord
• DM (album), 2017, by Mexican singer Dulce María
• "DM" (song), 2022, by fromis_9
• Dance marathon, a multiple-day charity event on U.S. college campuses
• Depeche Mode, an English synthpop band formed in 1980
• Drum major (marching band), the leader of a marching band
• Death Metal, an extreme subgenre of heavy metal music

Social media

• Digital marketing
• Direct message

• Deutsche Mark (1948-2002), the former currency of Germany (and West Germany)
  • East German mark (1951-1990)

• Detroit and Mackinac Railway
• dm-drogerie markt, a German drugstore chain
• Dr. Martens, a brand of boots
• DM, IATA code of Arajet
• DM, then IATA code of Maersk Air, a former Danish airline which operated from 1969 until 2005

• Designated marksman, a soldier fulfilling the marksman role in an infantry squad
• Royal Naval Armaments Depot, Defense Munitions, sites are prefixed DM
• A US Navy hull classification symbol: Light minelayer (DM)

• Davis-Monthan Air Force Base, Tucson, Arizona, US
• Des Moines, Iowa, the state capital
• Dominica, an island nation in the Caribbean Sea (ISO 3166-1 alpha-2 code: DM)

Computing

• .dm, Dominica's top-level Internet domain
• Dimensional modeling, a set of techniques and concepts used in data warehouse design

Software

• Display Manager, a window system for Domain/OS on Apollo/Domain workstations
• Device mapper, a component of the Linux kernel that supports logical volume management
• X display manager, a graphical login manager

Medicine

• Degenerative myelopathy, a condition in dogs affecting the spinal cord
• Diabetes mellitus, a disease characterized by high blood sugar
• Difference due to memory, a neural activity effect
• Diminished motivation, a condition characterized by lack of motivation
• Double minute, fragments of extrachromosomal DNA in human tumors
• Myotonic dystrophy (DM-1/2/3), a chronic muscle-wasting disease
• n-Decyl β-D-Maltopyranoside, a maltoside detergent used when purifying membrane proteins
• Dermatomyositis, an inflammatory systemic disorder affecting the skin, muscles, and other organs

Physics

• Dark matter, in cosmology, hypothetical non-luminous matter
• Deformable mirror
• Dispersion measure, the amount of dispersion of radio waves by interstellar medium

Units of length

• Decimetre (dm), equal to ten centimetres
• Decametre (sometimes Dm), equal to ten metres
• Data mile (DM), in radar, equal to 6000 feet

Other uses in science, technology and mathematics

• Adamsite, a chemical agent used in riot control
• Differential Manchester encoding
• Distributed morphology, a theoretical framework in linguistics

• Dallas Mavericks, an NBA team
• Danske Mesterskaber, the Danish Athletics Championships
• Defensive midfielder, an association football position
• Divemaster, in scuba diving

• De minimis, a Latin legal term
• Diis Manibus, a Latin epitaphial acronym
• SJ Dm3, and Dm, Swedish locomotives
• District magistrate, senior local role in the Indian Administrative Service
• Des Moines, Iowa
• Gorontalo (vehicle registration prefix DM)