Seal Island, also known as Seal Rock, is an island in the Australian state of South Australia located in Encounter Bay off the south coast of Fleurieu Peninsula approximately 2.7 kilometres (1.7 miles) south-east of Victor Harbor.

Seal Island is located about 2.7 kilometres (1.7 miles) south-east of Victor Harbor and 3.7 kilometres (2.3 miles) east-north east of Rosetta Head (also known as The Bluff).

The island is described as being "a 1 hectare (2.5 acres) mound of tumbled granite bounders scoured of soil" that "reaches 12 m (39 ft) above sea level".

[2] The island's name is reported as suggesting the presence of an Australian sea lion or a New Zealand fur-seal colony on the island during the early 19th century.

[4] Since 2012, the waters surrounding its shores are located within the boundaries of the Encounter Marine Park.