CFB may refer to:

  • Canadian Forces base, military installation of the Canadian forces
  • Caminho de Ferro de Benguela, railway in Angola
  • Cipher feedback, a block cipher mode in data encryption
  • Clube de Futebol «Os Belenenses», a football club in Portugal
  • Continental flood basalt, large volumes of dominantly tholeiitic basalt on continents
  • Complement factor B, a protein
  • Compact fluorescent bulb
  • Current feedback, a type of electronic feedback used in some operational amplifiers
  • Commission fédérale des banques (Swiss Federal Banking Commission)
  • CFB, the IATA code for Cabo Frio International Airport
  • CFB is acronym for Call Forwarding when Busy telecom service
  • Circulating fluidized bed combustion
  • Cfb, one of three symbols for the Oceanic climate under the Köppen climate classification system
  • Cytophaga-Flavobacteria-Bacteroides group, a previous name for the current Bacteroidetes phylum