French Island is the largest coastal island of Victoria, Australia, located in Western Port, 61 km (38 mi) southeast of Melbourne. In 1997, about 70% of the island was declared the French Island National Park, administered by Parks Victoria, and was listed in the former Register of the National Estate in 1984. The island is an unincorporated area under the direct administration of the government of Victoria, and is a declared locality of Victoria having its own postcode. Community issues are dealt by the French Island Community Association. The island is otherwise administered by the Department of Transport and Planning. The population of the island in 2011 was around 116 people, of which about 60 were permanent residents. By 2021 the population on census night was recorded as 139 with a median age of 52 years.

Western Port, commonly but unofficially known as Western Port Bay, is a large tidal bay in southern Victoria, Australia, opening into Bass Strait. It is the second largest bay in the state. Geographically, it is dominated by two large islands; French Island and Phillip Island. At the time it was renamed, its position was west of other known ports and bays, but Western Port has become something of a misnomer as it lies just to the east of the larger Port Phillip and the city of Melbourne. It is visited by Australian fur seals, whales and dolphins, as well as many migratory waders and seabirds. It is listed under the Ramsar Convention as a wetland of international significance.