B47 or B-47 may refer to:
- BMW B47, an inline-four diesel engine
- Bundesstraße 47, a German road
- B47 (New York City bus) in Brooklyn
- HLA-B47, a HLA-B serotype
- B-47 Stratojet, an American aircraft
This disambiguation page lists articles associated with the same title formed as a letter–number combination.
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