Thuronyi Bluff (66°48′S64°45′W) is a prominent escarpment on the east coast of the Antarctic Peninsula, which faces the Larsen Ice Shelf and the Weddell Sea and lies immediately south of the Antarctic Circle. It is located above Mill Inlet in British Antarctic Territory at the base of the Cole Peninsula, between Balch Glacier and Gould Glacier; it is part of Graham Land. The bluff was first observed in aerial photographs taken on December 22, 1947, during the Ronne Antarctic Research Expedition.