The Vesdre (or Weser and Vesder) is a river in Liège Province, eastern Belgium.
A few kilometres of the upper reaches also flow through the German municipality Roetgen and form part of the Belgian–German border.
The total length is approximately 64 kilometres (40 mi).
It is a right tributary to the river Ourthe.
Its source lies in the High Fens (Hautes Fagnes, Hohes Venn, Hoge Venen), close to the border with Germany near Monschau. It flows through an artificial lake (Lake Eupen), and then through the towns of Eupen, Verviers, Pepinster and Chaudfontaine. The Vesdre flows into the Ourthe a few kilometres from Liège where the Ourthe in turn flows into the river Meuse.
