Ewell Castle School is a 3–18 mixed, private day school and sixth form in Ewell, Epsom, Surrey, England. It was founded in 1926 by Herbert Budgell as a boarding school and became fully mixed in September 2015. It consists of the Main House, Glyn House, Chessington Lodge and Fitzalan House.

Ewell is a town in the borough of Epsom and Ewell in Surrey, England. It is approximately 12 miles (19 km) south of central London and 2 miles (3.2 km) northeast of Epsom. In the 2011 Census, the town had a population of 34,872. The majority of which (73%) is in the ABC1 social class, except the Ruxley Ward that is C2DE.