Sir William Perkins's School is an independent day school for girls aged 11 to 18 in Chertsey, Surrey, England. It is situated on 49,000 m2 of greenbelt land on the outskirts of Chertsey. The school was founded in 1725 and the Good Schools Guide described the school as "a friendly school with very good academic standards - ideal for girls who enjoy healthy competition and getting stuck into what is on offer."