Neptune Glacier () is a glacier on the east coast of Alexander Island, Antarctica, 12 nautical miles (22?km) long and 4 nautical miles (7?km) wide, flowing east into George VI Sound and the George VI Ice Shelf to the south of Triton Point. Although Neptune Glacier is not located within the mountain range Planet Heights, the glaciers name derives from the mountain range along with many other nearby glaciers named after planets of the Solar System.