Lewis Island is an island located in Spencer Gulf off the east coast of Jussieu Peninsula on Eyre Peninsula in South Australia approximately 29 km (18 mi) south-east of Port Lincoln. It was named by Matthew Flinders in memory of George Lewis who was one of the eight crew lost from a cutter that capsized sometime after being launched from HM Sloop Investigator to search for water on 21 February 1802. Since 2004, the island has been part of the Memory Cove Wilderness Protection Area.