Steinvikholm Castle (Steinvikholm slott) is an island fortress on the Skatval peninsula near Stjørdal, in Nord-Trøndelag county, Norway. The castle was built over seven years, from 1525 to 1532, by Norway's last Catholic archbishop, Olav Engelbrektsson. Steinvikholm castle became a powerful fortification by the time it was built, and it is the largest construction raised in the Norwegian middle age.