B20

B20 may refer to:

Aircraft

 * Blackburn B-20, a 1940 experimental aircraft
 * Boeing Y1B-20, A Boeing experimental heavy bomber
 * Douglas A-20 Havoc, designated the ZB-20 at the end of its life

Roads

 * B20 motorway (Spain), a ring road around Barcelona in Catalonia
 * B20 road (Cyprus)

Other uses

 * B20 (biodiesel), a mixture composed of 20% of biodiesel with 80% of diesel
 * B20 (bronze), bell bronze or bell metal, a kind of bronze used in bells and cymbals
 * B20 (New York City bus) serving Brooklyn
 * Berezin B-20, a 20 mm caliber autocannon used by Soviet aircraft in World War II
 * Honda B20 engine
 * Volvo B20 engine
 * 20 amp, type B – a standard circuit breaker current rating
 * Bravo Two Zero, an eight-man British Special Air Service patrol that was tasked with finding Iraqi Scud missile launchers during the Gulf War
 * The designation number assigned to the coupe version of the Lancia Aurelia motorcar, produced between 1951 and 1958
 * Sicilian Defense, Encyclopaedia of Chess Openings code
 * Boron-20 (B-20 or 20B), an isotope of boron
 * Burroughs B20, a line of microcomputers
 * Business 20, an offshoot of the G20, which hopes to present a forum for the world's largest companies to discuss global issues
 * B20 Summit, an international summit meeting of delegates from business groups around the world