GMB may refer to:
Arts and media
- GMB (album), 2012, by hip-hop trio Pac Div
- Good Morning Britain, a 2014 British breakfast television programme
- Good Morning Britain (1983 TV programme)
Honours
- Grand Bauhinia Medal, Hong Kong
- Great Master of the Order of the Bath, UK/Great Britain
Places
Africa
- The Gambia, by ISO 3166 alpha-3 country code
- Gambela Airport, Ethiopia, by IATA code
Europe
- Gardermoen Line (), a high-speed railway
- Graduates Memorial Building, at Trinity College, Dublin, Ireland
- Grimsby Town railway station, England, by GBR code
Other uses
- GMB (trade union), UK
- Gladding, McBean, American ceramics company
- Martin GMB, 1918 US bomber aircraft