| Horn, Hornbach | |
| Map: | Pfaelzerwaldkarte_Flussgebiete_Hornbach.png |
| Subdivision Type1: | Countries |
| Source1: | Entenbaechelthal |
| Source1 Location: | Bitche, Moselle (France) |
| Source1 Coordinates: | 49.0245°N 7.4436°W |
| Source1 Elevation: | 315m (1,033feet) |
| Mouth: | Zweibrücken, RP (Germany) |
| Mouth Coordinates: | 49.2548°N 7.3366°W |
| Mouth Elevation: | 219m (719feet) |
| Basin Size: | 150km2 |
| Tributaries Right: | Musbach, Roelbach, Schwartzenbach, Schweixer Bach, Trualbe/Schwarzbach, Strolbach, Altbach, Bottenbach, Felsalb, Kirschbach, Mauschbach, Buchholzgraben, Althornbach, Atzenbach |
| Waterbodies: | Entenbaechelweiher, Hasselfurther Weiher |
| Length: | 33km (21miles) |
The river Horn (French: Horn; German: Hornbach) is a left tributary of Schwarzbach flowing through the department of Moselle, in northeastern France, and the state of Rhineland-Palatinate, in southwestern Germany.
The Horn's headwaters rise in the French town of Bitche, in the Moselle Department, following a north by north-eastern course, before forming a part of the border between France and Germany. As the Franco-German border takes a sharp turn to the west, the Horn continues into Germany. Here, it follows a roughly north-western course, ending in the German town of Zweibrücken, emptying into the Schwarzbach. Its length in France is .