Dartford is the principal town in the Borough of Dartford, Kent, England. It is located 18 mi (29 km) south-east of Central London and is situated adjacent to the London Borough of Bexley to its west. To its north, across the Thames estuary, is Thurrock in Essex, which can be reached via the Dartford Crossing. To its east lies the Borough of Gravesham and to the south the district of Sevenoaks. It had a population of 51,240.

The Borough of Dartford is a local government district with borough status in the north-west of the county of Kent, England. It is named after its main town of Dartford, where the council is based. Other notable settlements include Greenhithe, Stone and Swanscombe, along with an emerging new town at Ebbsfleet, and a number of smaller villages. The borough lies just outside the administrative boundary of Greater London, but a sizeable part of it lies within the M25 motorway which encircles London. Many of the borough's urban areas form part of the Greater London Built-up Area. The borough had a population of 116,800 at the 2021 census.