Säppi (Swedish: Sebbskär) is an island on the coast of Bothnian Sea in the municipality of Eurajoki in Finland.

Island of Säppi is best known of the 1873 built Säppi Lighthouse and its community which are inventoried by the Finnish National Board of Antiquities as one of Cultural heritage sites of national importance in Finland.

[1] Säppi has been a part of the Bothnian Sea National Park since 2011.

[3] Säppi is one of the seven Finnish islands with a wild mouflon population.

[5] From early spring to October the island hosts a herd of highland cattle used by Finnish forest administration for conservation grazing.