In 1888, a one-room school was opened on Glashan's current site. The school was originally named Hugh Street School (the previous name of Kent Street).
This one-room school had one teacher and 99 students!
The newly amalgamated school board commissioned Moses Edey to design a replacement school in 1892. Edey was the architect of several other historic buildings in Ottawa, such as the Aberdeen Pavilion at Lansdowne, the Daly Building (Ottawa's first department store), and the Centretown United Church. Edey's 1892 design had four rooms. This 1892 design was named Archibald Street School (the previous name of Arlington Street).
By 1897, the school population had grown significantly again and Edey was asked to make a second design. This was a large, rectangular, two-story school with a mansard roof design.
The school was expanded again in 1922 and the roof was removed and a third story was added in 1931.
Glashan Public School converted to an intermediate school in 1931.
In 1905, the school’s name was changed to Glashan Public School to honour Dr. J.C. Glashan, school inspector for the board from 1876 to 1910.
The current school building was built in 1979.
At the time of construction, a time capsule was placed in a secret compartment hidden behind a wall at the school.
The school celebrated its 125th birthday in 2017 by having students guess the contents of the time capsule and by hosting a party for current school families and alumni.
Please see the following Ottawa Citizen article about the school's history.