Dundas is a community and urban district in the city of Hamilton in the Canadian province of Ontario. It is nicknamed Valley Town because of its topographical location at the bottom of the Niagara Escarpment on the western edge of Lake Ontario. The population has been stable for decades at about 20,000, largely because it has not annexed rural land from the protected Dundas Valley Conservation Area. Notable events are the Buskerfest in early June and the Dundas Cactus Festival in August.