GDM may refer to:
- Desportivo Maputo, a Mozambican football club
- Gardner Municipal Airport (Massachusetts)
- Giardini di Mirò, an Italian rock band
- Gesellschaft für Didaktik der Mathematik
- Gestational diabetes mellitus
- Gibraltar Democratic Movement
- GNOME Display Manager
- Gold Decoration for Merit, an honour of South Africa
- Gradient discretisation method
- Grassroots Development Movement, a political party in Liberia
- Greyhound Mexico