Por-Bazhyn (Por-Bajin, Por-Bazhyng, Russian: Пор-Бажын, Tuvan: Пор-Бажың) is a ruined structure on a lake island high in the mountains of southern Tuva (Russian Federation). The name derives from Tuvinian 'clay house'. Excavations suggest that it was built as an Uyghur palace in the 8th century AD, converted into a Manichaean monastery soon after, abandoned after a short occupation, and finally destroyed by an earthquake and subsequent fire. Its construction methods show that Por-Bazhyn was built within the Tang Chinese architectural tradition.