Farciennes Castle () is a derelict 17th-century castle in Farciennes in the province of Hainaut, Wallonia, Belgium. The present building stands on the site of an earlier castle of the 14th century.
Neglect and ill-treatment continued unchecked, even though the castle was classed as a structure of national importance in 1926, until eventually, in 2008, the town of Farciennes bought what remained of the building, which was only a skeleton of what was once was a beautiful estate. Large parts of the building have collapsed and there is nothing that can save the castle from inevitable destruction.