La Lomme, Lhomme or L'Homme is a river in Belgium, a tributary of the Lesse on the right bank which forms part of the catchment area of the Meuse.
Its source is located on the plateau of Saint-Hubert and more precisely in Bras-Bas (municipality of Libramont-Chevigny). It waters the villages of Poix-Saint-Hubert (where the Hydroelectric Power Station of the Val de Poix is located), Smuid, Mirwart, Grupont, Lesterny, Forrières, Jemelle and the town of Rochefort where it dug the Lorette cave, To throw himself into the Lesse at Eprave. It is one of the steepest slopes in Belgium. Its clear and fishy waters still attract enthusiasts of trout fishing.