The Weald and Downland Open Air Museum is an open-air museum located in Singleton, West Sussex, England. The museum exhibits over 45 historic buildings from various parts of Southern England, dating from the medieval period to the 19th century. It is a popular tourist destination and is one of the most highly rated attractions in the South East of England. The museum features a variety of buildings, from a medieval hall house to a Victorian schoolroom. Visitors can explore a variety of traditional rural crafts and activities, such as blacksmithing and woodworking.

There are also historic gardens, an apiary, and a farm with a variety of animals. The museum also offers a range of activities and events throughout the year, including traditional country pursuits such as falconry and clay pigeon shooting, and a range of educational activities for children. The museum also has a special events programme, including a range of seasonal activities such as re-enactments, music festivals, and family days.

The museum also houses a library and archive, which is open to the public and the museum also runs a research programme to further knowledge of the historic environment and traditional building techniques. The museum also has a shop, café and craft centre. The museum is open all year round, and admission is free for members and children under 16. There is a small fee for non-members. The museum is also a registered charity, and relies on donations and volunteers to help maintain its buildings and collections.