CBG may refer to:
- Cambridge Airport, England (IATA code)
- Cambridge railway station, England (National Rail station code)
- Cannabigerol, a non-psychoactive cannabinoid found in Cannabis
- Capillary Blood Glucose
- Carrier battle group
- CBG (AM), a CBC Radio One station in Gander, Canada
- CB Richard Ellis, which uses the NYSE ticker symbol CBG
- Centraal Bureau voor Genealogie, the Dutch research centre for genealogy
- Central Bank of The Gambia
- Cigar box guitar
- Communist Bulletin Group
- Corticosteroid-binding globulin
- Comic Book Guy, character on The Simpsons
- Comics Buyer's Guide