The Lightship Finngrundet is a lightvessel built in 1903 and now a museum ship moored in Stockholm, Sweden.

[1] She was the second Finngrundet lightvessel, built in Gävle, Sweden in 1903 and replacing one dating from 1859.

She was stationed on the Finngrund banks in the Baltic Sea 40 nautical miles (74 km) northeast of Gävle during the ice-free part of the year.

She was extensively modified in a refit in 1927 at Öregrunds Ship och Varvs AB, the original paraffin light being replaced with an AGA beacon.

Further modifications carried out in 1940 included the addition of wireless communication along with equipment for her to function as a weather station, and the electrification of her light.