Kingston Grammar School is an independent co-educational day school in Kingston upon Thames, England. The school was founded by royal charter in 1561 but can trace its roots back to at least the 13th century. It is a registered charity under English law. It was a boys' school from its foundation until 1978, when the first girls were admitted.

Kingston upon Thames, colloquially known as Kingston, is a town in the Royal Borough of Kingston upon Thames, south-west London, England. It is situated on the River Thames, 10 miles (16 km) south-west of Charing Cross. It is an ancient market town, notable as the place where some Saxon kings were crowned.