The Boosenburg is a lowland castle in Rüdesheim am Rhein, Rheingau-Taunus-Kreis, Hesse, Germany, located in the Rhine valley and dating back to the 12th century.

The castle was probably built at the end of the 12th century as the family seat for the knight, Lord Fuchs of Rüdesheim, as a square building surrounding a very high, double stepped bergfried, protected by a rampart and moat.

[1] After the counts of Schönborn-Wiesntheid became owners in 1830, they tore down in 1836 all the buildings apart from the bergfried, which they built even higher, adding Gothic Revival merlons.

[2] Carl's son, Hans Otto Jung, a founding member of the jazz group Hotclub Combo [de] in the 1940s, played there with notable musicians on two Steinway pianos.

[3] His son, Edu Jung, also active as a jazz musician, opened the venue[2] also for concerts of the Volkshochschule (VHS, folk high school).