 Mapped from surveys by the United States Geological Survey (USGS) and U.S. Navy air photos (1959–65).Named by Advisory Committee on Antarctic Names (US-ACAN) for Edmond R. Siemiatkowski, auroral physicist at Byrd Station, 1964.Sierra Island

Sierra Island () is a narrow island which is marked by a series of small elevations throughout its length, lying northwest of Dee Island and north of Greenwich Island in the South Shetland Islands, Antarctica.