B37 may refer to:
- HLA-B37, an HLA-B serotype
- Bundesstraße 37, a German road
- an alternate name for human protein ATN1
- Strathalbyn–Goolwa Road in South Australia with the route number "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)
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