Athe (Dutch: Aat) is a Belgian municipality locate in the Walloon province of Hainaut. The Ath municipality includes the old communes of Lanquesaint, Irchonwelz, Ormeignies, Bouvignies, Ostiches, Rebaix, Maffle, Arbre, Houtaing, Ligne, Mainvault, Moulbaix, Villers-Notre-Dame, Villers-Saint-Amand, Ghislenghien (Dutch: Gellingen), Isières, Meslin-l'Evêque, and Gibecq.