B37 may refer to: HLA-B37, an HLA-B serotype Bundesstraße 37, a German road ATN1, a human protein alternately known as B37 Lockheed B-37, a Lockheed Ventura aircraft Soviet submarine B-37, a Project 641 or Foxtrot-class diesel submarine of the Soviet Navy's Northern Fleet Soviet gun B-37, caliber 406 mm. (:ru:406-мм морская пушка Б-37) BMW B37, a three-cylinder turbo diesel engine designed by BMW