Lydney is a town and civil parish in Gloucestershire, England. It is on the west bank of the River Severn in the Forest of Dean District, and is 16 miles (25 km) southwest of Gloucester. The town has been bypassed by the A48 road since 1995. The population was about 8,960 in the 2001 census, reducing to 8,766 at the 2011 census. Increasing to 10,043 at the 2021 Census.

Gloucestershire is a ceremonial county in South West England. It is bordered by Herefordshire to the north-west, Worcestershire to the north, Warwickshire to the north-east, Oxfordshire to the east, Wiltshire to the south, Bristol and Somerset to the south-west, and the Welsh county of Monmouthshire to the west. The city of Gloucester is the largest settlement and the county town.