GBM may refer to:
Medicine
Science and technology
- Gateway belief model
- Geometric Brownian motion
- Gradient boosting, a machine learning technique
- Generic Buffer Management, a graphics API
- Gamma-ray Burst Monitor, aboard the Fermi Gamma-ray Space Telescope
Other uses
- Grand Besançon Métropole, a French intercommunal structure
- GBM (League of Legends player) (born 1994), Korean video gamer
- Game Boy Micro, a 2005 handheld game console and the last model in the Game Boy line
- Garbaharey Airport, in Somalia
- Garhwali language
- Grand Bauhinia Medal, an honour of Hong Kong
- Greater Britain Movement, a short-lived far-right group
- Green Belt Movement, a Kenyan environmental organisation