B50

B50 or B-50 may refer to:
 * B-50 Superfortress, an airplane
 * BSA B50, 500cc motorcycle
 * International Statistical Classification of Diseases and Related Health Problems (ICD-10), code for Plasmodium falciparum malaria
 * Leyland Royal Tiger, a UK bus
 * Sicilian Defence, an Encyclopaedia of Chess Openings code
 * A Vietnamese RPG-2 rocket-propelled grenade launcher
 * B-50, alias of Gap-43 protein
 * HLA-B50, a HLA-B serotype
 * Bestune B50, a compact sedan