Denis-Perron Dam (French: Barrage Denis-Perron) is a rockfill embankment dam spanning the Sainte-Marguerite River, a tributary of the lower Saint Lawrence River, in eastern Quebec, Canada. Standing 171 metres (561 ft) high and 378 metres (1,240 ft) long, the dam is the primary component of Hydro-Québec's Sainte-Marguerite 3 hydroelectric project.