Architectural Conservancy of Ontario Archives of Ontario Built Heritage News DOCOMOMO Ontario List of Heritage Conservation Districts in Ontario Local Planning Appeals Tribunal | Environmental and Land Tribunals Ontario Ontario Association of Architects Ontario Heritage Act + More Blog Ontario Heritage Act Part IV Designations Ontario Heritage Act Part V Designations Ontario Heritage Act, R.S.O. 1990, c. O.18 Ontario Heritage Toolkit Ontario Heritage Trust Ontario Planning Act, R.S.O. 1990, c. P.13