Newnham Murren is a hamlet in the civil parish of Crowmarsh, in the South Oxfordshire district, in the county of Oxfordshire, England. It is in the Thames Valley, about 0.5 miles (800 m) east of the market town of Wallingford. Newnham Murren is now contiguous with the village of Crowmarsh Gifford. It has a church called St Mary's Church.