Thornlea Secondary School is a public high school, in the Regional Municipality of York, that opened in 1968 and is located in Thornhill, Ontario, Canada, on the northeast corner of Bayview Avenue and Willowbrook Road, just south of Highway 407. The school began in 1968 as an educational experiment. The curriculum was varied and specialized, following a trimester system, and students were encouraged to address their teachers by their first names and focus on independent learning. Around 1980 this model gave way to a more traditional academic environment.