Central Lancaster High School (CLHS) is a mixed-sex state secondary school and sixth form located in Lancaster, England. Located on Crag Road on the Ridge area in east Lancaster the school originally opened in 1966 as Castle Secondary Modern School but in 1986 amalgamated with Greaves Secondary Modern School from the south side of Lancaster, moving all the Greaves pupils up to the larger more modern site on Crag Road and renaming the two amalgamated schools as Central Lancaster High School.