Thomastown Secondary College opened its doors in 1971 with an initial enrolment of 80 students and 4 staff including founding Principal Dick Davies. As the new buildings were not ready at the time, the school began on the grounds of Lalor High School, moving to its current site later that year
The College grew quickly through the 1970s as the population of Thomastown and surrounds increased. By the mid-1980s it was one of the larger High Schools in the state.

Thomastown – the suburb and the school – has always been diverse and multi-cultural. Initially the school was made up of students from an Anglo-Celtic and German background as well as more recent arrivals from Italy and Greece. Macedonians joined the school in the 1970s and ‘80s, while students from South East Asia and the Pacific Islands, Lebanon, Turkey, the Middle East more broadly, Africa and from across Europe arrived through the ‘90s and into the new century.

Our College now boasts a student body whose parents and grandparents hail from 40 different countries from around the world as well as Indigenous students whose ancestors have been on this land for more than 40 000 years. Our staff reflect the diversity of our College community.

As we approach our 50th anniversary, Thomastown Secondary College is a vibrant, energetic and forward looking school closely connected with our community.