Tadmarton is a village and civil parish in the Cherwell District of Oxfordshire, England about 4 miles (6.4 km) west of Banbury. The population according to the 2011 UK census was 541, an increase of 26% since 2001.
The Church of England parish church of Saint Nicholas is early Norman. The building was enlarged and the bell tower added in the 13th century. The church is a Grade I listed building.
The manor house has a 15th-century barn, believed to have been built for Abingdon Abbey.