Grays is the largest town in the borough and unitary authority area of Thurrock, in the ceremonial county of Essex, England. The town, which is both a former civil parish and one of Thurrock's traditional Church of England parishes, is located on the north bank of the River Thames.

Thurrock is a unitary authority area with borough status in the ceremonial county of Essex, England. It lies on the north bank of the River Thames immediately east of London and has over 18 miles (29 km) of riverfront including the Port of Tilbury, the principal port for London. Thurrock is within the London commuter belt and is an area of regeneration within the Thames Gateway redevelopment zone. The borough includes the northern ends of the Dartford Crossing.