Svartklubben lighthouse, Maritime lighthouse in Norrtälje Municipality, Sweden.

Svartklubben is a lighthouse on a small island east of Singö in Uppland. Its round stone tower, 12 metres high, was built thick-walled to hold a coal fire and has carried a black-and-white daymark since 1916. The lantern holds a Fresnel lens installed in 1899.

The 12-metre stone tower was completed in 1820 to carry a coal fire, making it Sweden's first covered coal-fired lighthouse. Colza-oil lamps and brass mirrors were added in the 1840s, a kerosene lamp in 1875, and the present lantern with a Fresnel lens in 1899. The tower was automated and de-manned in 1968.

The Swedish Maritime Administration maintains this navigational structure, which received official recognition as a listed building in January 1935.

The island is reached only by boat, and the keeper's former dwellings are now private homes, so landings should respect residents' property. The light shows two long flashes every fifteen seconds, with green, red and white sectors visible about 16 nautical miles out. The tower is a state building monument, so access to the interior is not open to visitors.

The tower's 12-metre stone walls were made thick to hold a coal fire, and it became Sweden's first covered stone-coal lighthouse. Since automation in 1968, two 1000-watt bulbs give two long flashes every fifteen seconds, visible about 16 nautical miles. The old keepers' houses are now privately owned.