Kökar is an isolated island to the south-east of the Åland archipelago, Finland.

It is also one of Ålands municipalities. It is reachable by boat from Långnäs on Åland or from Galtby with access to mainland Finland.

It has a population of 293 (2003) and covers an area of 57.80 km² (excluding sea) of which 0.33 km² is water. The population density is 5.1 inhabitants per km².

The municipality is unilingually Swedish.