St. Peter's Priory was an early Augustinian monastery located between the towns of Grinderslev and Breum, in north central Denmark.
St. Peter's church was built of granite blocks in the Romanesque style with rounded arches and a flat beam ceiling.
In the 1440s the Augustinian Abbey at Viborg was closed and St. Peter's came under the direct control of the Bishop Thorleif Olafssön (1438–50).
St. Peter's was a small, isolated house with a thatched roof and 'very poor' according to one of the first Lutheran parish priests at Grinderslev Church.
About the same time a tower was added to the west end of the nave, but construction was poorly done, and it would have to be rebuilt in brick about a hundred years later.
The priory was secularized and given by the last Catholic Bishop of Viborg, Jörgen Friis (1521–36), to the governor (Danish: lensmand) of Skivehus Castle.
In 1542 the estate was mortgaged, and then sold off in 1581 to Christoffer Lykke, a nobleman for 29 established farms, two small holdings, and two mills.
In 1722 the Bishop Søren Lintrop visited Grinderslev and found the priest negligent and the church and former priory buildings in serious disrepair.
A new manor house called Grinderslev Koster was built on the site of the priory in 1887 which can still be seen today, though it is privately owned.