Reigate was a hundred in the historic county of Surrey, England. It was geographically consonant with the southern two thirds of the current Borough of Reigate and Banstead together with two parishes in Tandridge and fractions of former parishes in the London Borough of Croydon and Borough of Crawley, West Sussex. Accordingly, it included the medieval-established town of Reigate with its motte castle and land which became the towns of Redhill and Horley.