Strängnäs Cathedral (Swedish: Strängnäs domkyrka) is a cathedral church in Strängnäs, Sweden, since the Protestant Reformation the seat of the Lutheran Diocese of Strängnäs. It is built mainly of bricks in the characteristic Scandinavian Brick Gothic style. The original church was built of wood, probably during the first decades of the 12th century, on a spot where pagan rituals used to take place and where the missionary Saint Eskil was killed during the mid 11th century. The wooden church was not rebuilt in stone and bricks until 1340, just after Strängnäs became a diocese.