Sommers (Russian: Соммерс; Finnish: Someri; Swedish: Sommarö) is an islet and a lighthouse in the eastern part of the Gulf of Finland, an arm of the Baltic Sea, just outside the Gulf of Vyborg, about 19 kilometres south of Virolahti, Finland, but it is now possessed by Russia.

[1] The lighthouse is situated on a rocky skerry, which is elevated a maximum of 16 metres above the Baltic Sea.

The lighthouse was given a third class lens system and a clockwork which rotated an oil lamp with a double wick.

The Imperial Russian Army began constructing defense works on this island when World War I erupted, but these were never completed.

There are also a number of buildings and radar masts on the island, probably to keep an eye on the increasingly busy shipping traffic in the area.