Somerville is a township and coastal rural locality in Victoria, Australia, 53 km southeast from Melbourne's central business district, as a part of the urban enclave on Western Port comprising Somerville, Hastings, Bittern, Crib Point, and Tyabb. Its local government area is the Shire of Mornington Peninsula. At the 2011 Census, Somerville had a population of 10,730. The size of Somerville is approximately 38 km².
The population of Somerville in 2001 was 10,049 people. By 2006 the population was 10,704 showing a population growth of 7% in the area during that time.
Originally an orchard town Somerville has experienced significant population growth over the last twenty years.
It is served by Somerville railway station on the Stony Point Line, as well as a bus service to Frankston.
Yaringa Marina, east of the township, offers boat access to Western Port.