Keysborough is a suburb in Melbourne, Victoria, Australia, 27 km south-east of Melbourne's Central Business District, located within the City of Greater Dandenong local government area. Keysborough recorded a population of 30,018 at the 2021 census.Keysborough was named after the Keys family who founded the town sometime after 1878.Keysborough is one of the largest suburbs in Melbourne by land area. Geographically, it is split into three sections, the southern portion of the suburb includes market gardens and semi-rural properties extending to its southern boundaries Pillars Road and the Mordialloc Creek, the middle portion of the suburb features large residential and industrial development which began in the 2000s, and the northern section of the suburb to its northern boundaries with Noble Park and Springvale South generally features housing predominantly built from the 1960s extending well into the 1990s. The suburb's western boundary is Springvale Road and eastern boundary is Dandenong Creek/EastLink.
The Post Office opened on 27 November 1973 and was known as Noble Park South until 1978.Today, Keysborough facilitates several primary and secondary schools, including the Keysborough campus of Haileybury College and Lighthouse Christian College. Parkmore Shopping Centre includes a Coles, Woolworths, Kmart, Big W, Australia Post and an assortment of specialty stores. As of 2002 the southern corner of the suburb was under development and new housing estates have been developed including The Keys, Hidden Grove, and Crystal Waters. In 2017, Elmswood and Somerfield are new housing estates in southern Keysborough currently under development.