B49 or B-49 may refer to: Bundesstraße 49, a German road B49 (New York City bus) in Brooklyn in the United States HLA-B49, an HLA-B serotype A postcode area in Alcester, Warwickshire, England Northrop YB-49, an American aircraft B-49 (submarine), a Soviet Foxtrot class diesel-electric hunter-killer submarine Persiaran Mokhtar Dahari, in Selangor, Malaysia