Barnes Cray is a place in the London Borough of Bexley.

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.

The remnants of the settlement became absorbed into Crayford with the building of a munition village to facilitate the expansion of Vickers' armaments factory during the 1915 to 1919 period. Following World War One Crayford Urban District Council erected further housing estates to the north, eventually merging with estates spreading southwards from Erith.