Southampton is a rural locality of the Shire of Donnybrook–Balingup in the South West region of Western Australia. The Blackwood River and runs through the locality from its south-eastern corner to the north-west.

Southampton and the Shire of Donnybrook–Balingup are located on the traditional land of the Wardandi people of the Noongar nation.

The locality is home to three heritage listed sites, two of which are on the State Register of Heritage Places, Ferndale and Lewana, while the third one, Bridge Cottage, is on the municipal register. Ferndale, a single-storey mud brick and corrugated iron building and one of the earliest homesteads in the area, dates back to 1859, built by the earliest white settlers in the Balingup district. Lewana, meaning wind in the local indigenous language, dates back to 1931, and consists of a homestead, a barn, five forestry cottages, a cabin, a workshop and seven single garages. All buildings are constructed from jarrah and weatherboard, with corrugated iron roofs.