A Heritage Overlay or HO is one of a number of planning scheme overlays contained in the Victorian Planning Provisions, for use in planning schemes in Victoria, Australia. The heritage overlay schedule of each local government planning scheme lists sites of local and state significance (Victorian Heritage Register) but does not include sites on the Australian National Heritage List. An easy to follow description of how to read a heritage overlay and the different related documents is found at the City of Ballarat Website - What is a Heritage Overlay.