Clifton High School is a co-educational independent school in Clifton, Bristol, England. The school is the only one in the region to operate the Diamond Edge model of education. This model means boys and girls are educated together from Nursery to Year 6, then separately in some subjects between Years 7 and 9. In Years 7 to 9 boys and girls are taught separately for English, Mathematics, Biology, Chemistry, Physics and Games. They are then taught together in all subjects from Years 10 to 13. Clifton High School was founded as a girls' school as the nearby Clifton College was then a boys' school. It became coeducational in 2009. It is a member of the Society of Heads.