Somerville is a town on the Mornington Peninsula in Melbourne, Victoria, Australia, 49 km south-east of Melbourne's Central Business District, located within the Shire of Mornington Peninsula local government area. Somerville recorded a population of 11,767 at the 2021 census. Somerville forms part of an urban enclave on Western Port comprising Somerville, Hastings, Bittern, Crib Point, and Tyabb. Statistically, it is part of Greater Melbourne. The size of Somerville is approximately 38 km2.