Kosel () is a municipality in the district of Rendsburg-Eckernförde, in Schleswig-Holstein, Germany; it took its present form in 1977 when the formerly independent municipality of Bohnert was merged into Kosel, and today includes the villages Hülsen, Lundshof, Missunde, Ornum, and Weseby.
Kosel lies about 5 km northwest of Eckernförde, directly on the Schlei inlet. Federal Highway 76 (BundesstraÃÂe 76), which runs from Eckernförde to Schleswig, passes through the municipality's territory. Rail connections are available in Eckernförde and Rieseby. South of Kosel lies Lake Bültsee.