Aylesbury Grammar School is a grammar school in Aylesbury situated in the English county of Buckinghamshire, which educates approximately 1300 students. Founded in 1598 in Aylesbury, Buckinghamshire by Sir Henry Lee, Champion of Queen Elizabeth I, Aylesbury Grammar School celebrated 100 years on its current site in Walton Road in 2007. It is commonly referred to by its students, staff and others in the local area by the abbreviation AGS.