Yazlovets Castle is a ruined castle in the former town (now village) of Yazlovets, Buchach Raion, Ternopil Oblast, Ukraine. It originated in the 15th century as a residence of the Buczacki noble family. In the 16th century, the castle was rebuilt by Jerzy Jazłowiecki who was buried there. Between 1649 and 1658, Aleksander Koniecpolski had a new string of fortifications (the so-called lower castle) erected around Jazłowiecki's keep. In 1747, Stanisław Poniatowski rebuilt the lower castle into his palace.