HR (General):

Human Resources Professionals Association of Ontario
HR for Employers (Government Site)
Human Resources and Skills Development Canada
Ontario Human Rights Commission - Hiring
Pay Equity Commission
Canadian Council on Rehabilitation and Work
WORKink
Association of Workers' Compensation Boards of Canada

Safety:

Employers' Advocacy Council
Office of the Employer Adviser
WSIB Safety Groups Program
Canadian Centre for Occupational Health and Safety
Canadian Society of Safety Engineering
Passport to Safety (youth safety programme)
Construction Safety Association of Ontario
Ontario Service Safety Alliance
Technical Standards and Safety Authority
Workplace Safety and Insurance Appeals Tribunal-Ontario

Construction:

Canadian Construction Association
Ontario General Contractors Association
Council of Ontario Construction Associations
Mechanical Contractors Association of Canada
Mechanical Contractors Association of Ontario
Mechanical Contractors Association of Hamilton
Construction Sector Council

Labour:

Ontario Ministry of Labour
Canada Labour Code
Trade Unions Act

Labour Boards:

Alberta
B.C.
Manitoba
New Brunswick
Newfoundland and Labrador
Nova Scotia
Ontario
PEI
Quebec
Saskatchewan
Canada Industrial Relations Board