Haga Castle (Haga Slott) is a castle by Lake Mälaren outside of Enköping in Uppsala County, Sweden. The earliest recorded owner of the Haga property was the Swedish noble, Sten Bengtsson (Bielke). He built a stone building on the property. His son Ture Stensson (Bielke) apparently moved from that site to where Haga's main building now stands. Up until the 1660s, Haga remained a medieval style castle, with irregularly built-on towers and wings.