The City of Onkaparinga (/ˌɒŋkəpəˈrɪŋɡə/) is a local government area (LGA) located on the southern fringe of Adelaide, South Australia.

It is the largest LGA in South Australia, with a population of over 170,000 people in both urban and rural communities and is also geographically expansive, encompassing an area of 518.3 km2.

The council is headquartered in the Noarlunga Centre with area offices situated in Aberfoyle Park, Woodcroft and Willunga.

[13] The council meets at the chambers in Noarlunga Centre on Hannah Road once a month on a Tuesday at 6.30pm.

The City of Onkaparinga has 13 elected members (including the mayor).