Buchanan is a locality in the Northern Territory of Australia located in the territory's west adjoining the border with the state of Western Australia about 612 kilometres (380 mi) south of the territory capital of Darwin and about 473 kilometres (294 mi) south-west of the municipal seat in Katherine. The locality's boundaries and name were gazetted on 4 April 2007. Its name is derived from the Nathaniel Buchanan, a pioneering drover who first brought cattle overland from Queensland to the Northern Territory in 1877.