The Lallemand Fjord (67°06′S 66°42′W / 67.100°S 66.700°W / -67.100; -66.700Coordinates: 67°06′S 66°42′W / 67.100°S 66.700°W / -67.100; -66.700) is a fjord located east of Arrowsmith Peninsula and west of Pernik Peninsula on Loubet Coast on the western side of the Antarctic Peninsula. It is over 48 km long and was named by Jean-Baptiste Charcot after the French geographer Charles Lallemand. The fjord begins at Sharp Glacier and runs roughly south to north, flowing into Crystal Sound near Detaille Island.