Panulirus cygnus is a species of spiny lobster (family Palinuridae), found off the west coast of Australia.

This was reassessed at the British Museum by Isabella Gordon in 1936 as Panulirus longipes at the request of Ludwig Glauert, a diagnosis that was conserved, despite further doubts, due to its extensive use by the state's crayfishing industry and associated legislation.

[6] The range of the species is along the coast of Western Australia, from Hamelin Bay to the North West Cape, and at islands such as the Houtman Abrolhos.

[6] The larvae of the species develop in the meadows of seagrasses of Western Australia, migrating out from these toward the deeper ocean and coral reefs such as the Abrolhos Islands.

[7] The species is known to have been caught since the settlement of Swan River Colony, in 1829, and expanded as the larger populations were discovered in remote locations of the state.

The industry came to be centred at the Houtman Abrolhos, at the edge of the continental shelf, where the mature crays occur in large populations.