The River Perry is a river in Shropshire, England. It rises near Oswestry and flows south to meet the River Severn above Shrewsbury. The channel has been heavily engineered, both to enable water mills to be powered by it, and to improve the drainage of the surrounding land. The middle section crosses Baggy Moor, where major improvements were made in 1777 to drain the moor, and a section of the river bed was lowered in the 1980s, to continue the process. The river was the scene of a major pollution incident in 1985, when pig slurry discharged into it, killing around 100,000 fish.