Highclere Castle is a Grade I listed country house built in 1679 and largely renovated in the 1840s, with a park designed by Capability Brown in the 18th century.

The 5,000-acre (2,000 ha) estate is  in Highclere in Hampshire, England, about 5 miles (8 km) south of Newbury, Berkshire, and 9.5 miles (15 km) north of Andover, Hampshire. The 19th-century renovation is in a Jacobethan and Italianate style produced by architect Charles Barry. It is the country seat of the Earls of Carnarvon, a branch of the Anglo-Welsh Herbert family.

Highclere Castle has been used as a filming location for several films and television series, including 1990s comedy series Jeeves and Wooster, and achieved international fame as the main location for the ITV historical drama series Downton Abbey (2010–15) and the 2019 and 2022 films based on it.

The house, Egyptian exhibition, and gardens are open to the public for self-guided tours during the summer months and at other times during the rest of the year, such as Christmas and Easter. The house also holds ticketed events, such as the Battle Proms picnic concert, and special guided tours throughout the year.