A south western county of England bordered by the Severn estuary, Herefordshire, Worcestershire, Warwickshire, Oxfordshire, Wiltshire, Somerset, Bristol and the Welsh county of Monmouthshire.

A local government unitary authority area in Gloucestershire, England created in 1996 on the abolition of the county of Avon. It is not administered as part of Gloucestershire, although historically part of that county.