St Helen Without is a civil parish in the Vale of White Horse district in the English county of Oxfordshire.

It is immediately west of Abingdon and includes the villages of Dry Sandford and Shippon.

A large part of the parish is occupied by Dalton Barracks and its associated airfield (formerly RAF Abingdon).

It became part of the Abingdon Rural District of Berkshire in 1894, and then part of the Vale of White Horse in Oxfordshire under the Local Government Act 1972.

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