Lester B. Pearson High School is a public senior high school located in Calgary, Alberta, Canada administered by the Calgary Board of Education. The school is named for Nobel Laureate and Canadian Prime Minister Lester B. Pearson.

The school has offered the French Immersion program since 2003 and in the following year of September 2004, Lester B. Pearson became a fully accredited International Baccalaureate World School Lester B. Pearson High School is one of the five schools in Calgary to be offering the International Baccalaureate Programme in English, the school also offers opportunities to earn a combination of French Immersion and IB course certificates.