Guichen Bay, (locally /ˈɡiːʃən/ GHEE-shən, French: Baie de Guichen) is a bay located on the south-east coast of the Australian state of South Australia about 115 kilometres (71 miles) northwest of the regional city of Mount Gambier and about 270 kilometres (170 miles) south-southeast of the state capital of Adelaide.

[2][4] A number of navigation aids are located around Cape Dombey at the bay’s south end.

[4][5][6] The Bungandidj people were living in the Robe region prior to the arrival of Europeans.

Baudin named the bay Ances des Albatross, but this was revised after his death, in Freycinet's publication, to Guichen Bay to honour French war hero Luc Urbain de Bouëxic, comte de Guichen.

[7] In the 1830s, Bungandidj woman "Black Maggie" was the first indigenous inhabitant encountered by European men, probably whalers, sealers or sailors visiting the area several years before the South Australian province was proclaimed or settled by Europeans.