HSwMS Najaden is a Swedish Navy training ship launched in 1897, previously preserved as a museum ship in Halmstad and moored on the river Nissan by Halmstad Castle, since July 2014 in Fredrikstad, Norway.
The three-masted, wooden hulled sailing ship was constructed at the Royal Naval Shipyard in Karlskrona in 1897 and served in the Swedish Navy as a sail training ship until 1938.
In 1946 she was taken over by the city of Halmstad and completely restored. She now serves as a museum ship and is in the care of the Association of the Friends of Najaden