O'Sullivan Beach, South Australia
| O'Sullivan Beach Adelaide, South Australia | |||||||||||||||
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| Coordinates | 35°07′08″S 138°28′30″E / 35.119°S 138.475°E | ||||||||||||||
| Population | 1,844 (SAL 2021) | ||||||||||||||
| Established | 1926 | ||||||||||||||
| Postcode(s) | 5166 | ||||||||||||||
| LGA(s) | City of Onkaparinga | ||||||||||||||
| Region | Southern Adelaide | ||||||||||||||
| County | Adelaide | ||||||||||||||
| State electorate(s) | Reynell | ||||||||||||||
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| Footnotes | Adjoining suburbs | ||||||||||||||
O'Sullivan Beach is a seaside suburb in the southern Adelaide metropolitan area, within the City of Onkaparinga. O'Sullivan Beach has a unique postcode of 5166.