Tarcoola is a town in the Far North of South Australia 416 kilometres (258 mi) north-northwest of Port Augusta. At the 2016 census, Tarcoola had no people living within its boundaries.

Tarcoola is now best known as the northern junction of the Sydney-Perth and Adelaide-Darwin railways, which share approximately 530 kilometres (329 mi) of track between Tarcoola and Crystal Brook. There is a triangular junction at Tarcoola which joins Crystal Brook, Darwin and Perth. Another triangular junction at Crystal Brook joins Tarcoola, Adelaide and Sydney.