KDM or Kdm may refer to:
- Korean domestic market, Korea's economic market system
- KDE Display Manager, a graphical login interface for Unix-like operating systems
- Key Delivery Message, a component of the DRM system used in DCI-compliant digital cinema servers.
- Knowledge Discovery Metamodel, OMG specification for architecture-driven modernization
- Kongelige Danske Marine (His/Her Danish Majesty's Ship) — ship prefix of the Royal Danish Navy