Trooz is a municipality of Wallonia located in the province of Liège, Belgium. On July 1, 2012, Trooz had 8,432 registered inhabitants, of whom 4,199 were male and 4,233 female. The total area is 24.00 km² which gives a population density of 351 inhabitants per km². Trooz is situated on the Vesdre River, and is part of the GREOA regional grouping for economic purposes. The municipality consists of the following districts: Forêt, Fraipont, Nessonvaux.