Wallaroo Plain is a locality in the Australian state of South Australia located on the west coast of Yorke Peninsula immediately adjoining Spencer Gulf about 148 kilometres (92 mi) north-west of the Adelaide city centre. Its boundaries were created in January 1999 along with the selection of the name. The name was derived from the plain which the locality now occupies. As of 2014, land within the locality was zoned for agriculture while a strip of land along the coastline adjoining Spencer Gulf was zoned for conservation. Wallaroo Plain is located within the federal division of Grey, the state electoral district of Goyder and the local government area of the District Council of the Copper Coast.