Niasvizh Castle or Nesvizh Castle (Belarusian: Нясвіжскі замак, Niasvižski zamak, Lithuanian: Nesvyžiaus pilis, Polish: zamek w Nieświeżu, Russian: Несвижский замок, Nesvizhskiy zamok) is a residential castle of the Radziwiłł family in Nesvizh, Belarus. It is 183 metres (600 ft) above sea level.
From 1921 to 1939 the complex was in Poland and was considered one of the most beautiful Polish castles in the Kresy region.
