Keri (Swedish: Kockskär) is a 3.1-hectare (7.7-acre) Estonian island in the Gulf of Finland of the Baltic Sea.

Keri is administratively part of Kelnase village in the Viimsi municipality of the Harju county.

Since then the lighthouse operates automatically; the power is derived from a wind turbine and solar panels.

On 14 June 1940, a Finnish civilian airliner Kaleva was shot down by Soviet military aircraft and drowned near the island, killing all nine people on board.

The wreck of Kaleva was found on 5 June 2024 by unmanned underwater vehicles near the Keri lighthouse in Estonian territorial waters at a depth of 71 to 76 meters.