This category is for Lawyers who are or were members of the Law Society of Ontario (including its predecessor name, the Law Society of Upper Canada) and who have practised law in the Province of Ontario in Canada, after Confederation in 1867.

It includes lawyers who were originally called to the Bar in Upper Canada or Canada West in the Province of Canada, if they continued to be active after July 1, 1867.

Lawyers who practised in Upper Canada or Canada West in the Province of Canada, but not in Ontario after July 1, 1867, are included in the sub-category Category:Lawyers in Upper Canada and Canada West.