Moulsford is a village and civil parish in South Oxfordshire. Before 1974, it was in the county of Berkshire, in Wallingford Rural District, but following the Berkshire boundary changes of that year it became a part of Oxfordshire. Moulsford is on the A329, by the River Thames, just north of Streatley and south of Wallingford. The west of the parish is taken up by the foothills of the Berkshire Downs, including the Moulsford Downs.