B45 may refer to:
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Bundesstraße 45, a German road
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B45 (New York City bus) in Brooklyn
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HLA-B45
HLA-B45 (B45) is an HLA- B serotype. The serotype identifies the B*45 gene-allele protein products of HLA-B.
B45 is a split antigen of the broad antigen B12
Vitamin B12, also known as cobalamin, is a water-soluble vitamin involved in m ...
, a HLA-B serotype
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B-45 Tornado, a U.S. Air Force bomber aircraft of the late 1940s
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