St. Catherine's Priory, Roskilde, was a priory of Dominican friars located in Roskilde. It was dissolved in the Reformation and a private house built on the site.
In 1699, the private house which replaced the Priory, became the Lutheran Roskilde Adelige Jomfrukloster (now known as Roskilde Kloster), a women's collegiate foundation. It should not be confused with the St. Agnes' Priory, Roskilde, which was a convent for women of the Dominican Order, but had nothing to do with the Lutheran women convent, which was founded upon the remains of the male Dominican convent.
The Dominicans established St. Catherine's Priory in Roskilde (the ancient capital of Denmark and the seat of the most important Danish diocese, the Diocese of Roskilde, or Zealand) in 1231. Source material for the Dominican priory in Roskilde is sparse, but it is clear that Roskilde ranked second only to Lund among the Dominican houses of Scandinavia during the Middle Ages. On several occasions the head of the regional order, the prior provincial, was elected from Roskilde.
Only a few of the friars are named. Friar Bo is named in a 1267 letter connected with the conflict between Archbishop Jacob Erlandsen and King Valdemar. Friar Bo was excommunicated for violating the decree of interdict laid down by the archbishop. Prior Petrus Brackæ gave all his worldly possessions to Sorø Abbey in 1312 and then became a Dominican at Roskilde. Perhaps the most famous Dominican friar of Roskilde was Johan Nyborg who was made Bishop of Roskilde in 1330.
The geatest patron of the Dominican friars of Roskilde was the immensely powerful Dowager Duchess Ingeborg (1301-c.1360), mother of King Magnus IV of Sweden and VII of Norway, who made them frequent gifts from at least 1330 onwards and also remembered them in her will.