Rydberg Peninsula is a broad ice-covered peninsula, long, between Fladerer Bay and Carroll Inlet, Palmer Land. Rydberg Peninsula is located at . Rydberg Peninsula was mapped by the United States Geological Survey (USGS) from surveys and U.S. Navy air photos, 1961-1966. Rydberg Peninsula was named by the United States Advisory Committee on Antarctic Names (US-ACAN) for Captain Sven Rydberg, commander of USNS Eltanin on Antarctic cruises, February 1962 to June 1963.