Hållö lighthouse, Lighthouse on Hållö, Sotenäs Municipality, Sweden

Hållö lighthouse is a cylindrical stone tower standing on a small island off Sweden's western coast. The structure has a white-painted base and a red cast iron lantern room at the top, from which light signals sweep across the water.

Built in 1841–1842 as a roughly 10-metre cylindrical stone tower, the lighthouse was lit in autumn 1842. Because it was too low and was obscured by Sälö to the west, engineer Nils Gustav von Heidenstam added a 5-metre steel-plate cone in 1868, bringing the tower to 20 metres and the focal height to 39.2 metres. It was automated in 1969 and has been a state building monument since 25 January 1935.

The lighthouse takes its name from the island of Hållö in Sotenäs Municipality. Since 1969 it has been automated and unmanned, after more than a century with keepers. From Midsummer to mid-August the Föreningen Hållö fyr association opens the tower to the public, who climb it for the view from Väderöbod in the north to Måseskär in the south.

The lighthouse is reached by ferry from the mainland, and guided visits are offered during the warmer months. Visitors should prepare for changing weather since the island is exposed to sea conditions.

The lighthouse's light can be seen kilometers across the sea and uses a regular flashing pattern to guide ships. This system of repeating light signals has proven reliable over many decades.