Hengistbury Head, formerly Christchurch Head, is a headland jutting into the English Channel between Bournemouth and Mudeford in the English county of Dorset. It is a site of international importance in terms of its archaeology and is scheduled as an Ancient Monument. Declared a Local Nature Reserve in 1990, the head and its surroundings form part of the Christchurch Harbour Site of Special Scientific Interest. It is also a Special Area of Conservation, Special Protection Area, an Environmentally Sensitive Area, and a Site of Nature Conservation Interest. The name "Hengistbury Head" refers to the whole headland area; the elevated portion is called Warren Hill.

There has been human activity on the site since the Upper Palaeolithic. During the Victorian era, it was heavily quarried, and in recent years tourism has become significant – it receives more than one million visitors annually. The various habitats on the Head provide a home for many plants, birds, and insects, some rare and critically endangered. Erosion remains a threat to the site, although long-term projects are intended to secure it for the future.

Several archaeological digs have revealed that the site was occupied during the Upper Palaeolithic. There is evidence of an open settlement of the Creswellian culture on the hill in the middle of the headland dating to around 14,100 years ago. With over 13,000 lithic artefacts it is probably the largest site of the period. Most interesting were several blades typically found at Upper Paleolithic sites across Europe, but rarely seen outside of caves in the UK, where open-air sites of this age are extremely rare. People at the Head were heavily involved with the production of blades, further excavations identified 649 tools, dominated by backed blades, endscrapers, and burins.

At the time Warren Hill would have overlooked a large river valley that was to become the English Channel. Once the sea had inundated the surrounding valley, Mesolithic hunter-gatherers exploited the site. Pollen analysis of peat from the Solent bed suggests a lightly wooded headland free of close-knit undergrowth during this period, an ideal habitat for game.