Coleraine Grammar School is a co-educational grammar school in Coleraine, County Londonderry, Northern Ireland that was established in 2015 following the amalgamation of Coleraine Academical Institution and Coleraine High School. The school was split over two campuses - Castlerock Road and Lodge Road - in Coleraine until November 2024 when, following the completion of new school buildings, the whole school was able to be located on the Castlerock Road campus. The Castlerock Road campus also includes significant sports grounds including rugby pitches, hockey pitch (to be completed 2025) and boat house on the River Bann.