Beersel Castle (Dutch: Kasteel van Beersel) is a medieval castle located in Beersel, Flemish Brabant in Belgium. Originating in 1300 under the auspices of the Duchy of Brabant, the water castle's present configuration dates to 1357. It was twice sacked and was subject to significant restorations in 1491 and 1617. Its present condition owes much to a major restoration in 1928–39. Built largely of brick, a rare material for such buildings at the time, around a circular enceinte, its major feature is its three large towers. Today it is open to the public and is considered one of Belgium's best-preserved castles.