The Eau d'Heure lakes (French: lacs de l'Eau d'Heure) is a complex of five artificial lakes in Wallonia, forming the largest lake area in Belgium.

The lakes are not far from the village of Cerfontaine, 50 kilometres (31 mi) south of the city of Charleroi, and the border with France.

The primary river feeding the lakes is the Eau d'Heure.

The largest lake, the Lac de la Plate Taille, is itself the largest single lake in the country, at 3.74 square kilometres (1.44 sq mi), while together the lakes have a surface area of 6.17 square kilometres (2.38 sq mi).

It is a popular tourist attraction, with water sports, including fishing, kayaking, diving and windsurfing.