King's Ely, is a co-educational public school and Cathedral school in the city of Ely in England. It was founded in 970 AD, making it one of the oldest schools in the world. It was given its first royal charter by King Henry VIII in 1541, its second by Queen Elizabeth I in 1562, and its third by King Charles II in 1666. The school consists of a nursery, a pre-preparatory school, a prep school, a senior school, a sixth form, and an international school. King's Ely is a member of the Headmasters' and Headmistresses' Conference. In 2021, The Independent Schools Inspectorate published their report writing that "King's Ely achieved the highest grading possible in every category inspected and was judged to meet or exceed all regulatory standards for independent day and boarding schools."

In England and Wales, a public school is a type of fee-charging private school originally for older boys. They are "public" in the sense of being open to pupils irrespective of locality, denomination or paternal trade or profession; nor are they run for the profit of a private owner.