Cape Northumberland (South Australia)
|Elevation||30 m (98 ft)|
|Location||28 km (17 mi) south south-west of Mount Gambier|
Cape Northumberland is a headland in the Australian state of South Australia located at the west end of MacDonnell Bay on the state's south east coast in the gazetted locality of Port MacDonnell about 28 kilometres (17 miles) south south west of the city of Mount Gambier. The cape is described by one source as being ‘about 30 metres (98 feet) high, is rugged and cliffy, with a hill rising to an elevation of 41 metres (135 feet) behind it.’ It is near the site of the lighthouse of the same name. It was named by the Royal Navy officer, James Grant, on 3 December 1800 after the Duke of Northumberland. 
Cape Northumberland is the southernmost point in the state. The name "South Australia" itself is a tautological place name (Australia being Latin for "southern land"), even though the state is not the southernmost part of the Australian continent, nor of mainland Australia.
- National Geospatial-Intelligence Agency (2014). Pub127, Sailing directions (enroute) East Coast of Australia and New Zealand (13th ed.). National Geospatial-Intelligence Agency (NGA). p. 3. Retrieved 25 November 2014.
- "Search result for "Cape Northumberland (Cape)" (Record no. SA0050995) with the following layers selected - "Suburbs and Localities" and " Place names (gazetteer)"". Property Location Browser. Government of South Australia. Retrieved 2 September 2016.
- "Northumberland, Cape". State Library of South Australia. Archived from the original on 3 April 2015. Retrieved 25 November 2014.
- South Australia. Department of Marine and Harbors (1985), The Waters of South Australia a series of charts, sailing notes and coastal photographs, Dept. of Marine and Harbors, South Australia, pp. Chart 2, ISBN 978-0-7243-7603-2
- Boating Industry Association of South Australia (BIA); South Australia. Department for Environment and Heritage (2005), South Australia's waters an atlas & guide, Boating Industry Association of South Australia, p. 179, ISBN 978-1-86254-680-6
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