Wild Horse Plains is a locality in South Australia on the eastern coastline of Gulf St Vincent about 69 kilometres (43 miles) north-northwest of the Adelaide city centre.

[7] Its name is attributed to Thomas Day, who found wild horses grazing within the locality around 1870.

[8] Its boundaries, created in June 1997, include the town of Wild Horse Plains, established in 1881 on Port Wakefield Road, and the former Government Town of Lorne.

[7] Wild Horse Plains lies within the federal Division of Grey, the state electoral district of Narungga[5] and the local government area of the Adelaide Plains Council.

[4][6] The post office opened in 1878, continued as a telephone exchange and closed in 1979.