Ascott-under-Wychwood is a village and civil parish in the Evenlode valley about 4.5 miles (7 km) south of Chipping Norton, Oxfordshire, England. The 2011 Census recorded the parish's population as 560.

The River Evenlode is a tributary of the Thames in Oxfordshire. It rises near Moreton-in-Marsh, Gloucestershire, in the Cotswold Hills and flows south-east to the Thames, its valley providing the route of the southern part of the Cotswold Line. The river flows for 45 miles (72 km) from source to the River Thames.