The Macquarie Lighthouse, also known as South Head Upper Light, was the first, and is the longest serving, lighthouse site in Australia. It is located on Dunbar Head, Vaucluse, about 2 kilometres (1 mi) south of South Head) near the entrance to Sydney Harbour. There has been a navigational aid in this vicinity since 1791 and a lighthouse near the present site since 1818. The current lighthouse was completed in 1883.

The lighthouse is still fully operational and is under the control of the Australian Maritime Safety Authority. The grounds are managed by the Sydney Harbour Federation Trust.