B57 or B-57 may refer to: BMW B57, a turbo-diesel straight-six engine, produced by BMW since 2015 Bundesstraße 57, a German road B57 (New York City bus) in Brooklyn B57 nuclear bomb Martin B-57 Canberra, a US-built version of the English Electric Canberra bomber Volvo B57, a bus by Volvo Group Sicilian Defence in the Encyclopaedia of Chess Openings HLA-B57, an HLA-B serotype