Lambsbach is a river in southwestern Germany. It flows into the Blies near Homburg.
The Lambsbach stream originates in the small village of Lambsborn, the stream flows through the Lambsbach Valley, a narrow, largely natural meadow valley framed on both sides by wooded hills. A small part of the valley is designated as the Lambsbach Valley Nature Reserve.
Further downstream, the Lambsbach flows through Bechhofen and west of the higher-lying Käshofen . At the L462 state road, the Lambsbach crosses the states and continues in Saarland through Kirrberg, past Emilienruhe, Ebersberg, and Audenkellerhof. Finally, it forms the boundary between and .
The stream flows into the Blies between Schwarzenbach, Schwarzenacker and Wörschweiler, just a few meters from the Erbach confluence in the Mastau.