The Gileppe is a river in Belgium with a length of about 20 km. It is a left tributary of the Vesdre. Its source is in the High Fens of eastern Belgium. The Gileppe flows through an artificial lake (Lac de la Gileppe), built in 1867-1878 and enlarged to 1.3 square kilometres in 1968-1971, creaed by the Gileppe Dam. The Gileppe flows into the Vesdre near Limbourg.