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. It also includes Bluewater, one of the UK's largest shopping centres. 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.
The neighbouring districts (clockwise from east) are Gravesham, Sevenoaks, the London Borough of Bexley and, to the north across the River Thames, Thurrock, to which it is linked by the Dartford Crossing.