St Kilda is an inner seaside suburb in Melbourne, Victoria, Australia, 6 km south-east of the Melbourne central business district, located within the City of Port Phillip local government area. St Kilda recorded a population of 19,490 at the 2021 census. St Kilda was named by Charles La Trobe, then superintendent of the Port Phillip District, after a schooner, Lady of St Kilda, which moored at the main beach in early 1842.