The Battle of Siikajoki (Finnish: Siikajoen taistelu) was fought between Swedish and Russian troops on 18 April 1808 at Siikajoki, approximately 60 km south of Oulu, Finland. During the first stage of the Finnish War, the Swedish commander Wilhelm Mauritz Klingspor had decided to retreat from southern Finland, so that the Swedes would gain time, and more troops could be moved to Finland via Tornio. The retreat was also made in an effort to delay battles until the seas thawed, and to reserve troops in case the Danes took the opportunity to attack Sweden.