Blewburton Hill is the site of an Iron Age hillfort located in Oxfordshire, in the southeast of England. It was a univallate hillfort (with a single rampart). The area is mostly farmland with some small areas of wooded copse to the south and the northeast. The hill fort may have been occupied from the 4th century BC to the 1st century BC, and replaced a small settlement surrounded by a stockade, which is estimated to have been built in the 5th or 6th century BC.