Halshany or Holszany Castle (Belarusian: Гальшанскі замак, Lithuanian: Alšėnų pilis, Polish: Zamek holszański) is the ruined residence of the Sapieha magnate family in Halshany, Hrodna Voblast, Belarus and was the seat of the one of the largest land estates in the Grand Duchy of Lithuania. Paweł Stefan Sapieha commissioned its construction and it was erected circa 1610 to replace the older castle, built by of the Holszanski princely family, of whom Sapiehas were descendants and heirs.
Also known as the Black Castle (although it is built of red brick), the residence formerly rivaled Mir Castle as the most elegant private château of the Grand Duchy of Lithuania. The name Black Castle in fact originally applies to a fictional building from a book by Uladzimir Karatkievich, which was loosely based on Halshany Castle.
The castle and the surrounding estates were devastated, robbed and looted, twice: by the invading Swedes troops during the Deluge (history) and during the Great Northern War in 1704. Due to financial stress experienced by the Sapiehas in the wake of the Domestic War and ongoing Great Northern War, the castle had never been fully restored.