The Ontario Heritage Trust (French: Fiducie du patrimoine ontarien) is a non-profit agency of the Ontario Ministry of Tourism and Culture, responsible for protecting, preserving and promoting the built, natural and cultural heritage of Canada's most populous province. It was initially known as the Archaeological and Historic Sites Board in the 1950s. In 1968, the Sites Board was incorporated into the Ontario Heritage Foundation by the Progressive Conservative government of John Robarts. Its name was changed to Ontario Heritage Trust in 2005 by an amendment to the Ontario Heritage Act. The Trust's current chairman is Dr. Thomas Symons.