Ekenäs Castle (Ekenäs slott in Swedish) is a castle located outside Linköping in Linköping Municipality, Östergötland, South-East Sweden. The present castle was built in the 17th century on top of the foundations of a medieval fortress from the 14th century. The lake surrounding the castle hill created a natural defense; however, this was drained in the late 19th century to create more arable land in the area.