York Mills Collegiate Institute is a public high school in Toronto, Ontario, Canada.

It is part of the Toronto District School Board, offering grades 9–12.

Prior to 1998, it was part of the North York Board of Education.

York Mills Collegiate's building was designed by the British-Canadian architect Peter Dickinson.

[1] York Mills offers a wide variety of extracurricular sports, including: Badminton, Baseball, Softball, Basketball, Cross-country Running Team, Curling, Field Hockey (girls), Golf, Tennis, Hockey, Rugby, Soccer, Swimming, Water-Polo, Track and Field, Ultimate Frisbee, Volleyball, and Weight Training.