Professional Engineers Ontario:
Established opeo.on.ca/n June 14, 1922, Professional Engineers Ontario (PEO) is the licensing and regulating body for engineering in the province. It fulfills the same role for engineers as the College of Physicians and Surgeons for doctors or the Law Society of Upper Canada for lawyers.

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Association of Consulting Engineering Companies - Ontario
ACEC-Ontario exists to promote and advance the business interests of our member companies and the value of engineering work they do. 

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Association of Consulting Engineering Companies | Canada:
The Association of Consulting Engineering Companies (ACEC) is a not-for profit organization that has been the voice of Canadian consulting engineering companies since it was founded in 1925.

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Ontario Society of Professional Engineers (OSPE):
The Ontario Society of Professional Engineers (OSPE) is a member-interest, advocacy organization, created jointly by Professional Engineers Ontario (PEO) and the Canadian Society of Professional Engineers (CSPE).