The Schwarzbach is a river in southwestern Germany, left tributary of the Blies. Its source is in the Palatinate Forest, near Trippstadt. It flows through the states Rhineland-Palatinate and Saarland. Towns along its course are Waldfischbach-Burgalben, Contwig and Zweibrücken. After 50 km, it flows into the Blies in Homburg-Einöd.