Torrens Island is an island in the Australian state of South Australia located in the Adelaide metropolitan area in the Port River Estuary about 15 kilometres (9.3 mi) northwest of the  Adelaide city centre.

An island in the Port River Estuary between the Port River to the west and Barker Inlet to the east, Torrens Island is located about 15 kilometres (9.3 mi) north-west of Adelaide.

According to the Australian Dictionary of Biography, Governor George Gawler in 1837 named the site after Robert Torrens senior, who was chairman of the South Australian Colonisation Commission, the board responsible for setting up and running the colony in its early years.

[3] Being uninhabited, an island, adjacent to Port Adelaide, and near Outer Harbor, Torrens Island was initially used as the site of a Quarantine Station for new arrivals (by sea) to South Australia.

[5] Tours of the heritage-listed Quarantine Station are conducted by the South Australian Maritime Museum.