Castle Acre Priory was a Cluniac priory in the village of Castle Acre, Norfolk, England, dedicated to St Mary, St Peter, and St Paul. It is thought to have been founded in 1089 by William de Warenne the son of the 1st Earl of Surrey who had founded England's first Cluniac priory at Lewes in 1077. The order originated from Burgundy. Originally the priory was sited within the walls of Castle Acre Castle, but this proved too small and inconvenient for the monks, hence the priory was relocated to the present site in the castle grounds about one year later.
The priory was dissolved in 1537, and its ruins are in the care of English Heritage, along with the nearby Castle Acre Bailey Gate and Castle Acre Castle.