The river Horn (French: Horn, pronounced [ɔʁn]；German: Hornbach, pronounced [ˈhɔʁnˌbax] ⓘ) 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.

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