Watchfield is a village and civil parish in the Vale of White Horse about 3 miles (4.8 km) southeast of Highworth in neighbouring Wiltshire. Watchfield is about 1 mile (1.6 km) north of the village of Shrivenham. Both villages used to be on the main road between Oxford and Swindon which is now the A420 road. The Vale of White Horse was part of Berkshire until the 1974 boundary changes transferred it to Oxfordshire.