Cape Don Light is an active lighthouse located on Cape Don, at the tip of the Cobourg Peninsula, Northern Territory, Australia, in Garig Gunak Barlu National Park, marking the entrance to the Dundas Strait.

[5] During the entire period that the tower was manned it also maintained meteorological records which were well placed to assist in cyclone development tracking.

An iron structure was deemed unsuitable due to the tropical conditions, and the local ironstone was not suitable for concrete, so materials had to be shipped from Melbourne.

The climate and the grade meant only two round trips could be made each day, and in addition, construction could only be carried out on the dry season, from April to November.

Though the structure was not damaged, 12 kilograms (26 lb) of mercury were lost from the mercury-bearing pedestal bath.

[5] The tower original light source was a 55-millimetre (2.2 in)[5] vapourised kerosene incandescent mantle, with an intensity of 150,000 cd and a visible range of 23 nautical miles (43 km; 26 mi).

The apparatus was a rotating pedestal floating in a mercury bath, operated by a clockwork mechanism with descending weights, which only had to be rewound once every twelve hours.

The apparatus is installed on a gear-less pedestal, rotating three times per minute,[5] showing a light characteristic of one white flash every 10 seconds (Fl.W.

[3] In 2005, the original lens and its rotating apparatus were discovered in storage and donated to the Queensland Maritime Museum in Brisbane.

The location is accessible for 4WD car only in the dry season (May–October) and requires permits and paying a fee.

[2] The head lighthouse keeper's house has been converted to a fishing lodge and is available for overnight accommodations.