Oakden is a suburb of Adelaide, South Australia, located to the north-east of the Central Business District. It was established as a housing estate named Regent Gardens in 1992 and is located on former Department of Agriculture land.
The area, which includes land formerly known as Gilles Plains and a small portion of SA Housing Trust properties and land from Hillcrest, was renamed 'Oakden' in 1993 after the maiden name of the wife of Osmond Gilles, who was South Australia's first Colonial Treasurer. Gilles married in 1825 to Patience Oakden at Hamburg, Germany, but she died in England in 1833. Her brother, a former business partner of Gilles, was the banker and pastoralist Philip Oakden. Her nephew was the South Australian explorer and pastoralist John Oakden.
Its boundary is Lord Howe Avenue, Oxford Street and Bristol Terrace to the south, Sudholz Road to the east, Grand Junction Road to the north and Fosters Road to the west.
Its notable buildings include the Salvation Army Corps and Community Centre; the Christadelphian Church run Heritage College Adelaide; James Nash House, a secure mental health facility; various former Hillcrest Hospital buildings, most of which have been converted for use by other tenants including for student accommodation, small business and nursing home; The Oakden Central, a tavern run by the Adelaide City FC with associated training venue; the Oakden Fire Station; and the remainder of the Strathmont Centre, a Government of South Australia institution for those with a severe intellectual disability.
Oakden has two retail establishments, housed in the same building on Sir Ross Smith Boulevard, consisting of a cafe and hairdresser.
It is home to Roy Amer Reserve, a regional park including wetlands that serves as a storm water capture and aquifer recharge system as well as a native fish sanctuary, which was constructed by the City of Port Adelaide Enfield in the early 1990s and won state and national engineering awards.