The first secondary school in the area was established on the school's former Jacklin Road site soon after the
Second World War in re-located Army buildings. Several years later, two schools were constructed in permanent buildings:
Elizabeth Fisher Junior High School and
Belmont High School. These were merged in 1973 into
Belmont-Fisher Secondary School, and a new library was constructed to connect the adjacent buildings. After two years under this name, it was shortened to the current
Belmont Secondary School. In 2021, in response to increasing enrollment and limited capacity, the
school board approved the transfer of the French Immersion program to
Royal Bay Secondary School over a three-year period. An expansion at
Royal Bay Secondary, completed prior to the transition, increased the school’s capacity by 600 students. The transfer was finalized at the end of the 2023–24 school year, with 2024 marking the final graduating class from the French Immersion program at Belmont, concluding a 30-year run that began in the 1993–94 school year. ==New facilities==