Grotto Point Light, Coastal lighthouse near Balgowlah Heights, Australia

Grotto Point Light is a white-painted masonry and brick domed tower on a rocky headland at the southern tip of Balgowlah Heights, on the north side of Sydney Harbour. Two barrel-vaulted service sections of decreasing height are attached to the tower, and a white picket fence surrounds the structure. The light shines through a horizontal slit of 2 by 1 metre about two-thirds of the way up the tower, using a catadioptric lens.

The decision to build the range lights was taken in 1909, construction began in 1910, and the light was first lit on 1 September 1911. It is one of four lighthouses in a style sometimes called "Disney Castle", along with Rosherville Light and the Vaucluse Bay range lights. The original carbide lamp generated acetylene gas on-site, later replaced by compressed gas cylinders brought by boat, and the light was eventually electrified.

The light's nickname, "Disney Castle", comes from its domed tower and two stepped barrel-vaulted service sections, a style shared with Rosherville Light and the Vaucluse Bay range lights. The white picket fence and all-white paint make the small structure easy to pick out from the water and from the Castle Rock track.

Visitors reach the lighthouse via the Castle Rock Trail, a walking path with moderate ascents through parkland. The site lies within a national park, so standard park protections and weather conditions should be considered when planning a visit.

The light shines through a horizontal slit 2 metres wide and 1 metre high, set about two-thirds of the way up the tower. Its lens is a catadioptric apparatus. Rosherville Light stands 1,550 metres behind it as the rear light of the range.