Lomond School was the result of a merger between Larchfield School (founded 1845 and previously called Larchfield Academy) and St Bride's School for Girls (founded 1895) in 1977. Larchfield Academy (often called Larchfield School) was a
preparatory school for boys in Colquhoun Street,
Helensburgh and was founded in 1858. Larchfield Academy had existed in various forms and in other buildings prior to that, with the original year of foundation given as 1845. The old school building was purchased along with the newly-completed Larchfield Academy in 1858 by James S. Scott. The school originally used both the Larchfield and St Brides sites. In February 1997, the St Brides building burnt down in a fire. In October 1998, a replacement building was built on the St Brides site and incorporated elements of the former building that were not destroyed by the fire. The design of the new building was completed by senior master Ian McKellar, an architect turned graphic communication teacher at Lomond, and Glasgow-based architects G D Lodge. The Larchfield site was also sold at around the same time. ==Notable former pupils==