Korsholm Castle (Finnish: Korsholman linna, Swedish: Korsholm slott, also known as Chrysseborg) was a medieval castle in Vaasa, Finland. It was probably built in the 1370s. It is possible that the castle was never more than a wooden fortification, surrounded by a moat. By the late 18th century it was ruined, and new buildings built on the mound destroyed any medieval remains. Today a low mound is all that remains of the castle.