Oswestry is a civil parish in Shropshire, England. It contains 140 listed buildings that are recorded in the National Heritage List for England. Of these, one is listed at Grade I, the highest of the three grades, four are at Grade II*, the middle grade, and the others are at Grade II, the lowest grade. The parish contains the town of Oswestry and the immediate surrounding area. The oldest listed building consists of the remains of the castle. The town grew onward from the 12th century, initially in the area around the castle. Further growth occurred during the 18th century as the town stood on the London to Holyhead road, and again following the arrival of the railway in 1848.