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
See also B2O: Boron monoxide, a chemical compound with the symbol B2O b2o: an online journal, an American peer-reviewed online journal