Bohnenländer Eiche, Natural monument near Bohnenland Forest House in Brandenburg an der Havel, Germany

The Bohnenländer Oak was a pedunculate oak growing near Bohnenland Forest House, distinguished by its exceptional size. Its trunk measured about 8 meters in circumference, making it one of the largest specimens of its kind in the country.

The tree received official protected status in 1934 as a natural monument, securing its legal safeguarding. A lightning strike in 1943 caused severe damage, leading to later reinforcement of the trunk with stone and clay to ensure the tree's survival.

The oak stood in the Altstädtischer Forst near the Forsthaus Bohnenland, by the hamlet of Bohnenland between the Bohnenländer See and the Gallberg. Its size made it a local reference point: in 2001 the trunk measured 8.42 m in circumference at one metre's height and 8.12 m at its narrowest point, the waist.

The oak stood in the Altstädtischer Forst near the Bohnenland forest house, roughly halfway between the Bohnenländer See and the Gallberg, outside the city centre. Since the trunk broke apart in the storm of 13–14 November 2015, there is no standing tree to visit; the site lies in open forest terrain.

The trunk's 1943 lightning split was filled with clay and bricked up with masonry by Hans Lubitz and Hermann Knape in 1956. At one metre height the girth was 8.42 m in 2001, and 8.36 m at breast height in July 2015, before a large branch broke in September and the tree split apart in the storm night of 13–14 November 2015.