Schloss Hollwinkel is a castle built at the end of the 13th century in the village of Hedem of the town of Prussian Oldendorf in the Westphalian Kreis Minden-Lübbecke. It is located south of the Mittelland Canal in the Alsweder lowland.
It is believed that Schloss Hollwinkel was founded at the end of the 13th century by a family of Holle, which was expelled from the Hildesheim region. About since the beginning of the 15th century it was owned by the family of Schloen Gen. Gehle. Hollwinkel was 1459 as a western outpost of the Bishopric of Minden in a feud with Osnabrück besieged and bombarded.