Wallington County Grammar School (WCGS) is a selective state boys' grammar school with a coeducational Sixth Form located in the London Borough of Sutton. From 1968 to the mid-1990s the school was known as Wallington High School for Boys. One of a handful of grammar schools in the borough, it is consistently ranked as one of the top performing state schools in the country based on its GCSE and A-level results.