Weston Collegiate Institute (Weston C.I., WCI, Weston), formerly known by its previous names of Weston Grammar School, Weston High School, Weston High and Vocational School and Weston Collegiate and Vocational School is a Grade 9 to 12 public high school located in the York South-Weston area of Toronto, Ontario, Canada. It is the second oldest high school in Toronto, after Jarvis Collegiate Institute. Weston CI is located on 100 Pine Street and has a student population of about 1043.