B50

B50 or B-50 may be:
* Bundesstraße 50, a German road
* B-50 Superfortress airplane
* Alcester, according to the list of postal districts in the United Kingdom
* Biodiesel#Fuel quality, standards and properties, a mixture that is half biodiesel
* B50, a Birmingham Small Arms Company motorcycle
* International Statistical Classification of Diseases and Related Health Problems (ICD-10) standard code for the type of malaria caused by Plasmodium falciparum
* Leyland Royal Tiger, a bus manufactured by Leyland Bus in the United Kingdom
* Sicilian Defence in the Encyclopaedia of Chess Openings
* UniClass code for the subject "History and theory of planning"
* Vietnamese RPG-2 rocket-propelled grenade launcher
* alternate name for human Gap-43 protein
* HLA-B50, an HLA-B serotype