Dufferin County is a county and census division located in Central Ontario, Canada. The county seat is Orangeville, and the current Warden is Wade Mills. The current chief administrative officer is Sonya Pritchard. Dufferin covers an area of 1,486.31 square kilometres (573.87 sq mi), and its population was 61,735 at the time of the 2016 Census.

Central Ontario is a secondary region of Southern Ontario in the Canadian province of Ontario that lies between Georgian Bay and the eastern end of Lake Ontario.