University Health Network (UHN) is a healthcare and medical research organization in Toronto, Ontario, Canada. It is the largest such research organization in Canada and North America, ranking first in Canada for total research funding. It was named Canada's top research hospital by Research Infosource in 2015, 2016 and 2017. It was created in 1986 by the Government of Ontario through the merger of four major hospitals: Toronto General Hospital, Toronto Western Hospital, with the Princess Margaret Cancer Centre, and the Toronto Rehabilitation Institute merged in with The Toronto Hospital in 1999 and the name changed to the University Health Network. All four hospitals are affiliated with the Faculty of Medicine at the University of Toronto and serve as teaching hospitals for resident physicians, nurses, and other healthcare professions. UHN also operates The Michener Institute, an applied health sciences college that opened in 1958.