Dean Close School is a co-educational private boarding and day school (for pupils aged 3–18) in the public school tradition, located in Cheltenham, Gloucestershire, England. The school opened in 1886 and is divided into pre-prep, preparatory and senior schools located on separate but adjacent sites outside Cheltenham town centre, occupying the largest single private area of land within the town, at some 50 acres.
Established in 1886 as an all-boys school, the school became co-educational in 1970. It takes day pupils, as well as boarders. Children as young as three join the pre-preparatory school, and the senior school teaches up to the age of eighteen.