Markham District High School

Markham District High School (or MDHS) is a public high school in the city of Markham, Ontario, Canada. It is one of 32 high schools in the York Region District School Board. Until the 2016–17 academic year, it was the only publicly funded school within York Region which had a non-semestered system. In the 2016–17 academic year, the school switched to a semestered system.