Jussarö Lighthouse (Swedish: Jussarö fyr, Finnish: Jussarön majakka or Jussaaren majakka) is a lighthouse situated on the skerry of Sundharu, approximately 4 kilometres (2.2 nmi) south of the island of Jussarö, outside Raseborg, in the western part of the Gulf of Finland.

[3] There were, however, structural and technical problems with its operation, for which reason a new lighthouse was built on the uninhabited Sundharu skerry to the south of Jussarö, and lit in 1922, when the old light was deactivated.

[1][2] The new Sundharu Lighthouse was the first in Finland designed to be automatically operated from the outset.

[1][4] The light source was gas (acetylene), with a tank large enough to only need refilling once a month.

[3] In 1984, the gas-lit source was replaced with one powered by a wind generator, and a solar panel was added in 1999.