Grassy Hill Light, Maritime navigation aid on Grassy Hill in Cooktown, Australia

Grassy Hill Light is a roughly 6-meter-tall conical structure built from corrugated iron sheeting over timber framing, set on a concrete base. It stands near the Endeavour River entrance and continues to operate as an active navigation aid for modern vessels.

A signal staff went up on Grassy Hill in 1874 and a temporary light followed by 1882. Portmaster George Poynter Heath reported to parliament in 1883 and 1884 urging a permanent tower, which was built in 1886 with a fourth-order fixed Chance Bros dioptric apparatus that Heath supervised installing that September. The light burned kerosene and was automated only in 1927.

The tower is painted white with a red dome and red concrete base, and since 1993 it has run on solar power. Cook Shire Council manages the site, and local volunteers maintain the tower, which was entered on the Queensland Heritage Register in 1997.

The site is managed by the Cook Shire Council and can be reached by road, with parking provided at the hill. The tower itself is closed to the public, so the light is seen from outside. The beam shows two white flashes every six seconds, visible only between 192° and 315°, and the station runs on solar power.

The tower is one of eight Queensland lighthouses built with a hardwood frame clad in corrugated iron, a cheaper alternative to prefabricated iron towers despite termite risk. Its 4th Order Chance Bros dioptric apparatus was installed under the supervision of Portmaster George Poynter Heath in September 1886.