Hascombe Hill is the site of an Iron Age hillfort close to the village of Hascombe in Surrey, England. The site was excavated in 1931 by S.E. Winbolt who dated the occupation of the site to the 1st Century BC. The hillfort encloses an area of approximately 2.4 hectares which is thickly wooded. The sides of the fort are naturally very steep which had been scarped at the top to make them almost unassailable. Encircling the crest of the hill is a defensive ditch 1.5 metres deep. The defences are reinforced on the north east side (where the hillfort joins the rest of the hill) with a strong line of ramparts and ditches broken by a single entrance passage some 24 metres long.
In the early 19th century it became an important naval telegraph station, using a mechanical form of semaphore to communicate with Netley Heath in Surrey on one side and Blackdown in Sussex on the other. A chain of such stations linked London with Portsmouth.