Coordinates: 54°43′23″N 6°12′43″W / 54.723°N 6.212°W / 54.723; -6.212 Antrim Grammar School is a grammar school in Northern Ireland. It is in County Antrim, in the North Eastern Region of the Education Authority. It is more commonly known by locals as "AGS". It has two neighboring schools, Parkhall Integrated College and the Steeple Nursery School.