Electoral district of Onkaparinga
| Onkaparinga South Australia—House of Assembly | |
|---|---|
| State | South Australia |
| Dates current | 1857–1938, 1956–1970 |
| Namesake | Onkaparinga River |
| Demographic | Rural |
| Coordinates | 35°10′S 138°30′E / 35.167°S 138.500°E |
Onkaparinga is a defunct electoral district that elected members to the House of Assembly, the lower house of the bicameral legislature of the Australian state of South Australia. It was established in 1857, abolished in 1902; re-established in 1938 and abolished again in 1970. It was named after the Onkaparinga River.