Langstaff Secondary School (LSS)[1][2][3] is a public high school in Richmond Hill, Ontario, Canada.

Langstaff Secondary School is one of six schools in the York District to offer a French Immersion curriculum.

Upon successful completion of the requisite French Immersion courses, students are eligible to receive a French Immersion Certificate.

[citation needed] Langstaff Secondary School offers the Advanced Placement programme to its students.

The school offers AP courses in Chemistry, English, French and Math (Advanced functions, Calculus and Vectors).