New Barn is a village in Kent, England. It is a compact residential area surrounded by open fields which lies four miles southwest of Gravesend. It is in the local government district of Dartford. The villages of New Barn and Longfield are within and give their names to the civil parish of Longfield and New Barn. New Barn is larger in population than Longfield, although has little in the way of services, being a recent development and purely residential in nature

Historically New Barn was divided between the parishes of Southfleet, Longfield and Northfleet. The greater part was in the parish of Southfleet, including New Barn House, New Barn Road, Southfleet Avenue and the western sections of Longfield and Fawkham Avenues up to the parish boundary, which bisected these roads in a north–south direction. To the south, Southfleet parish extended up to Pescot Avenue, with the boundary running east–west.