Alfriston Clergy House in Alfriston, Polegate, East Sussex, England, was the first built property to be acquired by the National Trust. It was purchased in 1896 for £10. The house lies adjacent to the Church of St. Andrew. It is a Grade II* listed building. The house is open to the public.

Alfriston is a village and civil parish in the East Sussex district of Wealden, England. The village lies in the valley of the River Cuckmere, about four miles (6 km) north-east of Seaford and south of the main A27 trunk road and part of the large area of Polegate. The parish had a population of 829 at the 2011 census.