B45 or B-45 may refer to:
- Bundesstraße 45, a German road
- B45 (New York City bus), in Brooklyn, USA
- HLA-B45, a HLA-B serotype
- North American B-45 Tornado, a U.S. Air Force bomber aircraft of the late 1940s
This disambiguation page lists articles associated with the same title formed as a letter–number combination.
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