Mundaring Weir Road is a road in the outer eastern suburbs of Perth, Western Australia that links Mundaring and Kalamunda. Although an earlier rough track existed in a similar route, the road was developed in the late 1930s. It is the primary access route for Mundaring Weir, a dam and tourist attraction. It is a single carriageway for its entire length, with one lane in either direction. It crosses the alignment of the long since removed Mundaring Weir Railway a number of times, before crossing the Helena River just west of the first pumping station for the Goldfields Water Supply Scheme.