All Cannings Cross is the name of farm and an archaeological site close to All Cannings, near Devizes in the English county of Wiltshire. The site is a scheduled ancient monument. It is notable as the first site where the emergence of iron age technology in Britain was identified by archaeologists. In 1911 it was first investigated by Ben and Maud Cunnington after they were informed of finds of numerous hammerstones in a ploughed field in the Vale of Pewsey. Subsequent excavation by the Cunningtons encountered a thick layer of humic material containing a high concentration of pottery and animal bone as well as both bronze and iron tools. The date of the site was estimated at c. 500 BC, a time of transition from the Bronze Age to the Iron Age.