We are a K-12 private day and boarding school located in Markham, Ontario, Canada. With our unwavering dedication, care and support, we nurture our tomorrow’s thinkers to becoming responsible and compassionate global citizens.
J. Addison School is proud to announce that we are an Official 2020 Top Choice Award Nominee! Thank you to all of those who have taken the time to nominate us! Now, we need your help to WIN! Voting is… more
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Montessori Programs Ages 3 to Grade 2 
Elementary School Grades 3 to 8 
Secondary School Grades 9 to 12 
Boarding Program Grades 7 to 12 
Summer Programs K to Gr. 12