Founded in 1886 by Sir Edward Coey and John Crawford,[1][2] it has around 760 pupils and 50 teaching staff.

22 new classrooms, a new sports hall, new staff offices and a new canteen were built, as well as a new atrium, reception and Headmaster Suite.

Furthermore, a new Music Department was constructed towards the rear of the building, with a large classroom, offices and tuition rooms.

To celebrate the 125th Anniversary of Larne Grammar School, a new astro-turf hockey pitch, four tennis courts and a new pavilion were built.

All classrooms have been fully refurbished during the 2012/13 school year, with new equipment being added such as Apple Computers, new desks and new chairs; all of which under the orders of new Headmaster Jonathan Wylie.

[3] The following strengths were identified: With J Wilson as headmaster, the school flourished with pupils gaining an overall excellent standard of teaching with GCSE and A Level grades much higher than the Northern Ireland average, which has the highest average throughout the UK.

[4] On 9 March 2007, the 1st XV rugby team won the Schools Trophy by beating Omagh Academy 11–3 in the final.

[8][9][10] The lowest of the subsidiary competitions, the Medallion Trophy, was won in 2008 when Downshire High School were narrowly defeated by 13–12 in the final.