Consumer & Governmental Affairs Bureau part of FCC

Marechal Rondon Airport – (IATA airport code) in Cuiabá, Mato Grosso, Brazil

Game Boy Color (known as CGB in development)

Compagnie des Chemins de Fer de Grande Banlieue or CGB, a defunct railway in France.

Christlichen Gewerkschaftsbund Deutschlands, the German Christian Workers' Federation

Cosmic gravitational wave background, a relict of the Cosmic inflation in the CMB