This article investigates and analyzes ecclesiastical and canonical influence on legal rituals in medieval Swedish provincial laws (ca. 1200–1350). As Swedish legal rituals were performative and founded in the older oral legal culture, the provincial laws almost never describe how rituals were performed because this was so self-evident. In them, we can find examples of legal rituals that were disappearing, newly introduced, and reformulated through ecclesiastical influence. Certain rituals that had earlier been important (e.g., ordeals and legal adoption) had disappeared or were becoming extinct by the time the provincial laws were written down. Legitimation by consequent marriage that conformed to the Church’s classification of illegitimacy and strengthened the sacrament of matrimony replaced earlier adoption rituals. New rituals were introduced by the Church (baptism) and molded by the Church (oaths and formula for giving away the bride). While the procedure of oath-taking was not described in the provincial laws, the Church replaced swearing on weapons or oath-rings with oaths on books. Ecclesiastical rituals were also in the process of transformation during the so-called classical period of canon law (1140–1234). Even if the development of canon law made some Swedish legal rituals redundant, the Church was not averse to rituals in general, but rather sought to reformulate them to fit its changing legal system and new definitions of sacraments.