Barnes Cray is an area in south-east London within the London Borough of Bexley. It is located on the Greater London border with Kent, bordering the Dartford Borough. It is located north west of Dartford.

Up until the Victorian era it was a hamlet a kilometre downstream of Crayford where no more than sixteen homes were clustered. A calico-printing works drew water power from the culverted River Wansunt in early Victorian times, being later adapted for the manufacture of rubber goods, then felt and finally Brussels carpets. This carpet mill was demolished by 1890 and Barnes Cray House, the next largest building, was cleared by 1933, ending its days as a nursing home.