DEM (disambiguation)
- Day Eight Music
- Dem language
- Democratic Party (United States)
- Democratic Party (disambiguation)
- Democrats (Brazil)
- Demonstrative
- Department of Environmental Management (disambiguation)
- Deus ex machina
- Deutsche Mark
- Diethyl malonate
- Diffuse element method
- Digital elevation model
- Discrete element method
- Display Encode Mode
- ISO 4217
- Jakub Dębski
- Julia set
- Latin
- Mandelbrot set
- Peoples' Equality and Democracy Party
- USGS DEM