The school was formed as part of a merger between two secondary/intermediate schools: Bangor Girls High School and Gransha Boys' High School. The name for the newly formed school was Bangor Academy and Sixth Form College. A W J Hyndman was appointed to be the school's first principal. The motto of Gransha Boys' High School was
Conando Progredimur ("endeavour to be better"). The school was eventually bulldozed and cleared in 2008.
Northern Ireland's Department of Education announced on 1 March 2001 that a new school campus was to be built to accommodate 1,650 pupils with an investment package totalling £21 million. The schools officially merged in 2001. It was decided to locate the Junior year groups, years 8, 9, and 10, at the Gransha Road campus; the Senior year groups, years 11, 12 and Sixth Form, were based at the Castle Street campus. All year groups moved into the new school building located on the Castle Park Road in 2008. In March 2023, the school announced its plans to "transform" into an
integrated school. The parent/guardian ballot took place between 6 May and 6 June 2023. Almost 80% of parents and guardians at Bangor Academy who voted supported the plans. The plans were rejected by Northern Ireland education minister
Paul Givan. The schools demographics, within the 2024/25 academic year, were 58%
Protestant, 3%
Roman Catholic and 39% other. == School emblem ==