Diepenbeek Castle (, also known as the Rentmeesterij van Alden Biesen) is a castle in Diepenbeek near Hasselt in the province of Limburg, Belgium. The building consists of a 15th-century keep with a 17th-century main block. It was once the establishment of the steward () of the nearby Commandery of Alden Biesen, whence the alternative name.https://loket.onroerenderfgoed.be/archeologie/rapporten/eindverslagen/1541/bijlagen/4381 Vanaenrode W., I. Van de Staey & E. Wesemael 2021: Eindverslag Diepenbeek, Kasteel – Opgraving naar aanleiding van de herprofilering van een slotgracht, Tongeren. p=13
See also List of castles in Belgium
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