Kingston Secondary School (KSS) is a high school located in Kingston, Ontario, Canada. After the closing of Kingston Collegiate and Vocational Institute, considered the oldest public secondary school in Ontario and the second oldest in Canada, and Queen Elizabeth Collegiate and Vocational Institute students from both schools were phased into KSS. As of 2023, KSS accommodates 1,340 students, with approximately 240 being in middle school and 1,100 in secondary school.