On Monday, September 15, 1958, Glenmuir High School welcomed its first batch of fifty-five (55) students. His Excellency, Sir Kenneth Blackburne, Governor of Jamaica, officially declared the school opened, two weeks later.

Known then as Glenmuir Co-educational High, the school was part of an extensive educational programme launched that year by the then Lord Bishop of Jamaica, the late Rt. Rev. Percival W. Gibson.

History records that Custos George W. Muirhead offered his property in Mocho, Clarendon, as a possible site for the school. Eventually the location of his May Pen home, situated on 25 acres of land, was made available at a cost of £13, 500. Robert DeRoux was entrusted with the task of making sure that ‘Muir’ was forever immortalized in the name of the school.

This house provided classrooms, and the three staff members along with headmaster, Dr. Sydney Howard Scott, established the academic goal of preparing students for the General Certificate of Education at both levels.

In 1959, the school was recognized as a Government Grant-aided one. With a generous grant from the Anglican Church to the tune of £20,000,

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