Barrenjoey Head Lighthouse, Maritime beacon in Palm Beach, Northern Beaches of New South Wales, Australia.

Barrenjoey Head Lighthouse is an unpainted sandstone tower on Barrenjoey Headland at Palm Beach, north of Sydney. Its octagonal base carries Queen Victoria's 1880 royal cypher, and the circular tower rises three storeys to a gallery on large stone brackets. An oil room and corridor give access to iron floors and stairs, and a covered stair with a windbreak wall links the tower to the head keeper's cottage. The light stands at an elevation of 113 metres (371 ft).

The structure was built in 1881 to guide ships through Broken Bay and became an important milestone in maritime safety for the region. Local Hawkesbury sandstone was chosen for construction under architect James Barnet's design, creating a durable landmark that has endured for over a century.

The headland's name comes from an Aboriginal word for the small wallaby, recorded by Governor Phillip in 1788. Shell middens on Barrenjoey Headland were later burned for lime in colonial times. The lighthouse keepers' quarters, linked to the tower by a covered stair, form a sandstone compound sheltered from the wind.

The lighthouse stands on Barrenjoey Headland at the northern end of Palm Beach, about 40 km north of Sydney. A walking track from Palm Beach leads to the summit, where the tower, keeper's cottages and sandstone walls form a small compound. The headland is part of Ku-ring-gai Chase National Park and is managed by the NSW National Parks & Wildlife Service.

The Smugglers track gets its name from 19th-century customs officers who monitored contraband activities in Broken Bay from this strategic vantage point. The name reflects how this coastal location was once a hotspot for illicit trade and official surveillance.