Coleraine Academical Institution

Coleraine Academical Institution (CAI and styled locally as Coleraine Inst) was a voluntary grammar school for boys in Coleraine, County Londonderry, Northern Ireland.

Coleraine Academical Institution occupied a 70-acre (28 ha) site on the Castlerock Road, where it was founded in 1860. It was, for many years, a boarding school until the boarding department closed in 1999. It was one of eight Northern Irish schools represented on the Headmasters' and Headmistresses' Conference (HMC). The school had an enrolment of 778 pupils, aged 11–19, as of 2012. The school was generally regarded for its high academic standards and extensive sporting facilities, including 33-acre (13 ha) playing fields, indoor swimming pool, boathouse, rugby pavilion, sports pavilion and gymnasium. The Templeton Auditorium lights can be seen from Harpurs Hill. The school has an extensive past pupil organisation, "The Coleraine Old Boys' Association", which has several branches across the world.

Coleraine Inst was nine times winner of the Ulster Schools Cup, the world's second-oldest rugby competition, in which it competed every year since 1876.

The school origins and land are tied to the Worshipful Company of Clothworkers, one of the Livery Companies making up the City of London Corporation.

As part of a general re-organisation of schools in the Coleraine area over a number of years, Coleraine Academical Institution was merged in September 2015 with Coleraine High School on Coleraine's Lodge Road and became a fully boys' and girls' grammar school called Coleraine Grammar School.