Cygnet River is a locality on Kangaroo Island in the Australian state of South Australia, about 192 kilometres (119 miles) south-west of the state capital of Adelaide and about 12 kilometres (7.5 miles) from the municipal seat of Kingscote.

[2] Cygnet River is located within the federal division of Mayo, the state electoral district of Mawson and the local government area of the Kangaroo Island Council.

[8] The locality also includes the Kingscote Airport and the Cygnet Estuary Conservation Park.

They are named after Cygnet, which was the fifth ship to arrive in South Australia in 1836.

[12] It had previously been named the Morgan River after Robert Clark Morgan, the captain of Duke of York, another of the ships in the First Fleet of South Australia.