The River Dorn is a river in Oxfordshire, England, that is a tributary of the River Glyme. The river rises from the limestone uplands of north Oxfordshire, about 1.5 miles (2.4 km) east of Chipping Norton (51.9587°N 1.4823°W) [River Dorn (source)], and flows southeast past Little Tew; through Sandford St.