B38

B38 may refer to:
 * Sicilian Defence, Accelerated Dragon, Encyclopaedia of Chess Openings code
 * Bundesstraße 38, a German road
 * XB-38 Flying Fortress, an experimental aircraft
 * BMW B38, a straight-3 automobile engine
 * B38 (New York City bus) in Brooklyn
 * HLA-B38, an HLA-B serotype