St. Thomas High School is a High School in the municipality of Pointe-Claire, situated in Quebec, Canada. It is a member of the International Baccalaureate Organization's certified Middle Years Programme. Saint Thomas High School is the second largest high school operated by the Lester B. Pearson School Board in Montreal. It is second to only Lindsay Place High School, which is also located in Pointe-Claire. For the 2008 school year, Saint Thomas High School ranked 88 out of all 466 schools in the province.