The Hamburger Flugzeugbau Ha 137 was a German ground-attack aircraft of the 1930s. It was Blohm & Voss' entry into the contest to equip the re-forming Luftwaffe with its first purpose-built dive bomber. Although the contest would eventually be won by the Junkers Ju 87, the Ha 137 demonstrated that B&V's Hamburger Flugzeugbau, not even two years old at this point, had a truly capable design team of its own. One Ha 137 single-seat prototype competed against the Henschel Hs 123 at Rechlin.

Hamburger Flugzeugbau (HFB) was an aircraft manufacturer, located primarily in the Finkenwerder quarter of Hamburg, Germany. Established in 1933 as an offshoot of Blohm & Voss shipbuilders, it later became an operating division within its parent company and was known as Abteilung Flugzeugbau der Schiffswerft Blohm & Voss from 1937 until it ceased operation at the end of World War II. In the postwar period it was revived as an independent company under its original name and subsequently joined several consortia before being merged to form Messerschmitt-Bölkow-Blohm (MBB). It participates in the present day Airbus and European aerospace programs.