St. Thomas High School (French: École secondaire St. Thomas) is an English-language public high school in the municipality of Pointe-Claire, in Quebec, Canada.

Founded in 1960, it was originally a Roman Catholic foundation,[1] and it is a member of the International Baccalaureate Organization's certified Middle Years Programme.

St. Thomas has a Code of Conduct developed collaboratively by staff, and parents, which ensures a student's right to be educated in a caring, respectful environment.

St. Thomas has an Honour Society in order to grant recognition to their top students.

The Lester B. Pearson School Board moved St. Thomas High (formerly at 120 Ambassador Avenue, Pointe Claire) into Lindsay Place High School in July 2021, whence Lindsay Place ceased to exist.