Merckenburg Castle, also known as Castle Heukelum, is a brick castle in the town of Heukelum in the municipality of West Betuwe in The Netherlands. It dates back to the 13th century. The castle has been destroyed and rebuilt twice. The first time was in the fourteenth century, the second time in the disaster year 1672, when the French blew up the building during the Franco-Dutch War. The castle was restored around 1700, attached to the keep that had not been destroyed by the explosions.