OGS Cemetery Ancestor Index and Locator
From the OGS website:
In 1973 the Ontario Genealogical Society initiated its Cemetery Project. Its goal was to identify all cemeteries in Ontario and to record all the monumental inscriptions within each cemetery. Currently, 96% of Ontario Cemeteries have been successfully transcribed by OGS and its 30 branches. To make this information accessible to the public, the OGS has launched its Cemetery Ancestor Name Index and the Ontario Cemetery Locator.