B45 may refer to:
*
Bundesstraße 45, a German road
*
B45 (New York City bus) in Brooklyn
*
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 meta ...
, a HLA-B serotype
*
B-45 Tornado, a U.S. Air Force bomber aircraft of the late 1940s
{{Letter-NumberCombDisambig