Le RÃ Âulx (; ) is a city and municipality of Wallonia located in the province of Hainaut, Belgium.
On January 1, 2006, Le RÃ Âulx had a total population of 7,977. The total area is 42.80 km<sup>2</sup> which gives a population density of 186 inhabitants per km<sup>2</sup>.
The municipality consists of the following districts: Gottignies, Le RÃ Âulx, Mignault, Thieu, and Ville-sur-Haine.
The Château du Rà Âulx, a family seat of the Comtes de Croÿ-Rà Âulx, is situated near the town.