Basildon is a civil parish in the English county of Berkshire. It comprises the small villages of Upper Basildon and Lower Basildon, named for their respective heights above the River Thames. Basildon is 7 miles from Reading, 47 miles from London and 20 miles from Oxford. The parish is bordered to the north by the River Thames and the Oxfordshire parishes of Goring and Whitchurch-on-Thames on the other side of the river. To the south of the river it is bordered by the parishes of Pangbourne, Bradfield, Ashampstead and Streatley. The parish forms part of the unitary authority of West Berkshire. It is within the Newbury parliamentary constituency.