Middle River is a locality in the Australian state of South Australia located on the north coast of Kangaroo Island overlooking Investigator Strait about 162 kilometres (101 miles) south-west of the state capital of Adelaide. Its boundaries were created in March 2002 for the “long established name” and include the following shack sites - Middle River Shack Site and King George Shack Site. In 2011, a portion of Middle River was excised and added to the adjoining locality of Western River.