The Ontario Hardwood Silviculture Studies Database includes descriptive information, or metadata, on over 90 historical & ongoing hardwood silviculture studies & trials in the province, most of which were initiated by the Ontario Ministry of Natural Resources, the Canadian Forest Service, or the forest industry. For each study, this report provides information on all available metadata, including a project overview; objectives; study layout or design; names of investigator & associated staff; current contact information; silvicultural treatments; measurements carried out; known or expected years of establishment, treatment, & measurement; review methods; comments; data locations, quality, & stability; tree species studied; location of study; characteristics of study sites; and known associated publications.