HTS was founded as an independent school in 1981 in Thornhill by members of Holy Trinity Church.  The founding Board of Governors, lead by its founding Chair, John Langton, hired Father John Rose, then Chaplain at Ridley College, as the founding headmaster.

The school’s first classrooms were in Holy Trinity Church’s basement. The school’s rapid expansion meant that within two years HTS outgrew the facility and had to relocate to a new campus that was a rented school property on Bainbridge Avenue in North York. The school’s present campus was built on land purchased by the Board of Governors in Richmond Hill. This campus was officially opened in 1985 with the Lieutenant Governor of Ontario, the Honourable Lincoln Alexander and the Archbishop of Toronto, the Most Reverend L.S. Garnsworthy in attendance. In the years since its relocation, the facility has been expanded three times and is currently how you see it today.

While Holy Trinity School is proud of its Anglican traditions, it welcomes members of all faiths.

This was the entire student body on the day Holy Trinity School opened. The black and white photo does not show the original school uniform colours, brown and beige.