Ashridge is a country estate and stately home in Hertfordshire, England. It is situated in the Chiltern Hills, an Area of Outstanding Natural Beauty, about 2 miles (3.2 km) north of Berkhamsted and 23 miles (37 km) north west of London. The estate comprises 5,000 acres (20 km2) of woodlands, commons and chalk downland which supports a rich variety of wildlife.

The Chiltern Hills are a chalk escarpment in southern England, northwest of London, covering 660 square miles (1,700 km2) across Oxfordshire, Buckinghamshire, Hertfordshire, and Bedfordshire, stretching 45 miles (72 km) from Goring-on-Thames in the southwest to Hitchin in the northeast. The hills are 12 miles (19 km) at their widest.