Old Oswestry is a large early Iron Age hill fort in the Welsh Marches near Oswestry in north west Shropshire, England. The earthworks, which remain one of the best preserved hill forts in the UK, have been described as "The Stonehenge of the Iron Age Period". After the hill fort was abandoned, it was incorporated into Wat's Dyke by the Mercians during the Early Medieval period.

William Jones Varley, FSA (1904–1976) was a British geographer and archaeologist, particularly known for his excavations of English Iron Age hillforts, including Maiden Castle and Eddisbury hillfort in Cheshire, Old Oswestry hillfort in Shropshire, and Castle Hill in West Yorkshire. He was also a pioneer of geographical research and education in colonial Ghana where he worked from 1947 to 1956, and was involved in historical conservation there.