The Nadreau Lake is a freshwater body located in the unorganized territory of Lac-Jacques-Cartier, in the La Côte-de-Beaupré Regional County Municipality, in the administrative region of Capitale-Nationale, in the province of Quebec, in Canada.

The hydrographic side of this lake is mainly served by a few forest roads for the needs of forestry and recreational tourism activities.

Because of its altitude, the surface of Lake Nadreau is generally frozen from the end of November to the beginning of April; however, safe circulation on the ice is generally done from mid-December to the end of March.

This forest area includes several swamps at several altitude levels: 813 metres (2,667 ft) to 847 metres (2,779 ft); especially around the lakes of Petit Pré, Grandpré, Gariépy, Étang des Silènes, Saulmer; as well as in the Malbaie River area, around Lac des Frelons and Lac des Sixty Six (this area seems to have 66 small lakes through swamps).

The toponym "Lac Nadreau" was formalized on December 5, 1968 at the Place Names Bank of the Commission de toponymie du Québec.