The Tyzenhauz family (, , , ) was a noble family of the PolishâÂÂLithuanian Commonwealth of German extraction. It was active in the Duchy of Livonia, Duchy of Courland and the northern Grand Duchy of Lithuania. Among the best-known members of the family were Gothard Jan Tyzenhauz, the Voivode of Dorpat (1634âÂÂ1640), Konstanty Tyzenhauz (1786âÂÂ1853), ornithologist, and Antoni Tyzenhauz (1733âÂÂ1785), the manager of royal property during the reign of Stanisà Âaw August Poniatowski. Antoni built Tyzenhauz Palace in Vilnius, Lithuania. In Rokià ¡kis, northern Lithuania, the family also built the neogothic church of St. Matthias and Rokià ¡kis Manor, which now houses Rokià ¡kis Regional Museum.
This family is a collateral branch of the medievally-originated Baltic German House of Tiesenhausen, which already in the late medieval epoch, held fiefs in Livonia and Estonia. Other branches of that family came to some prominence in Finland, in Sweden and in Imperial Russia.