Sir William Perkins's School is a private co-educational day school for girls and boys aged 11 to 18 in Chertsey, Surrey, England. Founded in 1725, it is situated on 13 acres of greenbelt land on the outskirts of Chertsey. The Good Schools Guide described the school as "a friendly school with very good academic standards - ideal for students who enjoy healthy competition and getting stuck into what is on offer."