The Lusatian Neisse (; ; ; Upper Sorbian: Łužiska Nysa; Lower Sorbian: Łužyska Nysa), or Western Neisse, is a river in northern Central Europe. It rises in the Jizera Mountains, near Nová Ves nad Nisou, in Czechia becoming the Polish-German border for its remaining , to flow into the similarly northward-flowing Oder.