The Provincial Plaque Program promotes an understanding of Ontario's past by interpreting significant heritage subjects at appropriate sites across the province. The plaques are distinguished by their blue and gold colour and bear the provincial coat-of-arms. The Archaeological and Historic Sites Board of Ontario erected the first provincial plaque in 1956. The Ontario Heritage Trust has been responsible for the Provincial Plaque Program since 1974.

The Provincial Plaque Program is a cost-sharing activity of the Ontario Heritage Trust. Applicants should consult with Trust staff before submitting their applications.