Castell de Castellciuró is a medieval fortress in Molins de Rei, Barcelona, positioned on a hillside near the Llobregat river within the Collserola mountains. First documented in the 10th century as a defensive fortress protecting the Llobregat valley during Spain's medieval March period, the castle underwent transformation into a fully developed fortification by the 14th century. By the 16th century it had passed to the Requesens family. Currently restored to its ruined state, the castle functions as a viewpoint and leisure area, serving as an entrance to Collserola Park. The site received designation as a Cultural Asset of National Interest in 1949.
