Hamelin Bay is a bay and a locality on the south west coast of Western Australia between Cape Leeuwin and Cape Naturaliste. It is named after French explorer Jacques Félix Emmanuel Hamelin who sailed through the area in about 1801. It is south of Cape Freycinet.
It was also was a small settlement and port in Western Australia on the coast of the Leeuwin-Naturaliste Ridge which was established to service the timber milling operations of M. C. Davies.
One of the Davies timber railways extended onto the Hamelin Bay Jetty. It was built in 1882 and extended in 1898. The remains of the Jetty have been reduced drastically, and only a few piles remain in site.
It was a difficult port, with prevailing weather creating difficult situations for most of the shipping that used the jetty. A significant number of wrecks occurred in the late nineteenth and early twentieth centuries. Even in the late twentieth century significant wrecks still occurred.