The Dr Challoner's schools share a common foundation dating back to 1624 when the grammar school (then for boys only) started in Old Amersham. Dr Challoner's Grammar School moved to its present site in Amersham-on-the-Hill in 1905 when it became co-educational. In 1937 the school was incorporated into the state system. After rapid growth it was decided to establish Dr Challoner's High School for Girls in nearby Little Chalfont in 1962 and Dr Challoner's Grammar School reverted to being for boys only. In 2015 Dr Challoner's Grammar School once again welcomed girls into its Sixth Form.