Flatflesa Lighthouse has been operational since 1902, and a total of seven lighthouse keepers, some with families, have lived and worked there over the years. The lighthouse is located in Lyngværfjorden, 4 km west of Gossa in Sandøy municipality. Flatflesa Lighthouse was lit on September 20, 1902. This lighthouse was intended to improve the navigation through Kråksund, which was often used by fishing vessels.

The establishment of the lighthouse was also strongly recommended by the fisheries inspectors in the Romsdal and Trøndelag districts. The lighthouse building was constructed of timber, and a 4th order lens apparatus was placed in a cylindrical lantern on the residence. The clockwork mechanism of the flashing apparatus had to be wound up every three hours.

An outbuilding and a boathouse with a winch, as well as a landing jetty with a jib crane, were also erected. The first staff consisted of a lighthouse keeper with a household. From 1933, a reserve assistant with six months of annual service was also employed.

In 1936, the lighthouse was extended after complaints about the light being too low. A high tower made of angle iron with a tubular staircase was added. The light height thereby increased by 9 meters.

In both 1944 and 1945, the lighthouse was attacked by Allied aircraft and severely damaged. In 1948, a 3rd order lens apparatus, providing a luminous intensity of 30,800 candelas, was installed. Electrical power from its own generators was installed in 1961. After the war, the staff consisted of a lighthouse keeper, an assistant keeper, and a reserve assistant. The lighthouse was manned until 1988 and is now automated and unmanned.

In 2018, an extensive restoration was carried out in collaboration with the Norwegian Coastal Administration.