DMO may be an abbreviation for:
- UK Debt Management Office
- Despatch Manager Online (Royal Mail's shipping solution for small businesses in the UK)
- Defence Materiel Organisation
- Dental Maintenance Organization
- Destination Management Organization, efforts to enhance tourism with involving of the stakeholders
- Destination marketing organization
- Devlet Malzeme Ofisi (State Supply Office - Government of Turkey)
- Digimon Masters Online
- Digital Mapping Organization
- Digital Media Online, Inc., the world's largest publisher in the digital media market
- Digital Money Order
- DirectX Media Objects
- Distributed Management Objects
- Direct Mode Operation (Tetra/PMR)
- Dive Medical Officer (United States Military)
- Domestic Market Obligation
- Domodedovo Airlines
- Warhammer 40,000: Dark Millennium Online