Differdange Castle (French: Château de Differdange), located on a hill in the centre of Differdange in southern Luxembourg, was built in 1577 although an earlier fortified castle of Differdange dates from around 1310. Today's residential castle is used by Miami University.
The first lord of Differdange Castle was Wilhelm, brother of the Lord of Soleuvre, who is mentioned in documents from 1310 when he owned a fortified castle. However, the lords of Differdange lasted only until the death of Wilhelm's grandson around the year 1400. When Soleuvre Castle burnt down in 1552, the owner Anna von Insenburg decided not to repair it but to build a Renaissance-style residential castle in Differdange serving both Soleuvre and Differdange.
At the beginning of the 20th century, the castle came into the hands of the local steel industry, now Arcelor Mittal who used it as a hotel and a restaurant for its staff.
Differdange Castle is probably the earliest example in Luxembourg of a château built entirely in the Renaissance style. It was originally intended both as a residence and a fortification with a moat and draw-bridge (now both removed) as well as loop-holes. It is constucted fully in accordance with the principles of Renaissance architecture, especially the use of the square both for the courtyard (15 by 15 metres) and the outer walls of the three buildings (30 by 30 metres) which surround it. The rectangular cross-framed windows are typlical of the period. The octagonal towers which are slightly higher than the central building provide balance between the horizonal and vertical dimensions.
Since 1997, the castle has been let to Miami University as a European teaching centre providing students with "a living history for their European experience".