Astor Island is an island lying between Rugged Island and Livingston Island in the South Shetland Islands, Antarctica. Surface area 12 hectares (30 acres).

The feature was named by the United Kingdom Antarctic Place-Names Committee in 1958 for B. Astor of the New York Lyceum of Natural History (now the American Museum of Natural History).

• Península Byers, Isla Livingston. Mapa topográfico a escala 1:25000. Madrid: Servicio Geográfico del Ejército, 1992.
• L.L. Ivanov et al. Antarctica: Livingston Island and Greenwich Island, South Shetland Islands. Scale 1:100000 topographic map. Sofia: Antarctic Place-names Commission of Bulgaria, 2005.
• L.L. Ivanov. Antarctica: Livingston Island and Greenwich, Robert, Snow and Smith Islands. Scale 1:120000 topographic map. Troyan: Manfred Wörner Foundation, 2009. ISBN 978-954-92032-6-4
• L.L. Ivanov. Antarctica: Livingston Island and Smith Island. Scale 1:100000 topographic map. Manfred Wörner Foundation, 2017. ISBN 978-619-90008-3-0

• Composite Antarctic Gazetteer
• List of Antarctic islands south of 60° S
• SCAR
• Territorial claims in Antarctica

• SCAR Composite Antarctic Gazetteer.
•  This article incorporates public domain material from "Astor Island". Geographic Names Information System. United States Geological Survey.