Olpenitz (Danish: Olpenæs) is a part of the town Kappeln in Schleswig-Holstein, Germany, at the mouth of the Schlei firth to the Baltic Sea.
Currently a naval base of the German Navy is situated here with three squadrons of minesweepers and minehunters and various auxiliary vessels. The base will be closed in the near future.
Coordinates: 54°39′44″N 9°59′29″E / 54.66222°N 9.99139°E / 54.66222; 9.99139