DMU may stand for:
- Dalian Maritime University, located in Dalian, Liaoning, China
- Decision making unit, in business-to-business sales and marketing (B2B & B2C)
- De Montfort University, located in the city of Leicester, England
- Des Moines University a medical school located in Des Moines, Iowa
- Diesel multiple unit, a diesel-powered, multiple unit rail vehicle.
- Digital mockup, a product visualization method and technology used by engineers
- Dimapur Airport, the IATA code for the airport in India
- Dimethylurea, a chemical substance produced from Dimethylamine (DMA) and urea
- Drag Make-Up Maneuver, a spacecraft orbital maneuver designed to counteract the effects of atmospheric drag
- Durham Miners' Association, a trade union representing miners in North East England