Longfield is a village and civil parish in the Dartford Borough of Kent, England. It borders the Sevenoaks District. It is located south west of Gravesend. It contains several shops, a pub, a 14th-century church and is recorded in the Domesday Book and Anglo-Saxon charters of 964-995.
Longfield fell within the Hundred of Axtane and its successor the Dartford Rural District. In 1974 the village became part of the Sevenoaks District of Kent in 1974. It was transferred to the Borough of Dartford in 1987.