Schwarzhorn, Mountain summit in Rätikon range, Switzerland and Liechtenstein

The Schwarzhorn is a 2,573-metre summit on the Swiss-Liechtenstein border in the Rätikon range of the Eastern Alps, rising south of Triesen above Fläsch. It is the second-highest summit in Liechtenstein, after the Grauspitz. Reference works such as "Die Orts- und Flurnamen des Fürstentums Liechtenstein" list it as a separate peak from the nearby Hinter-Grauspitz, with which it is sometimes confused.

The name Hinter Grauspitz is often applied to this summit, but the Liechtenstein reference work "Die Orts- und Flurnamen des Fürstentums Liechtenstein" treats Hinter Grauspitz and Schwarzhorn as two separate peaks. The mountain rises to 2,573 or 2,574 metres on the Swiss-Liechtenstein border in the Rätikon, making it the second-highest summit in Liechtenstein after the Grauspitz at 2,599 metres.

The name Schwarzhorn means "black horn", while Hinter Grauspitz is a separate peak according to the Liechtenstein reference book on place names. The summit lies on the border above Triesen and Fläsch, and the easiest route to Liechtenstein's highest peak, the Grauspitz at 2,599 m, runs over the Hinter Grauspitz and along grade 3–4 ridges.

There is no maintained trail to the summit; the easiest route runs over the Hinter Grauspitz and along ridges of UIAA grade 3 to 4, so sure footing and scrambling experience are needed. The mountain lies on the border above Triesen in Liechtenstein and Fläsch in Switzerland.

The Schwarzhorn is often confused with the Hinter Grauspitz, but Liechtenstein's reference work on place and field names lists them as two separate peaks. The same work distinguishes Grauspitz, Vorder-Grauspitz, Hinter-Grauspitz and Schwarzhorn as four distinct summits. At 2,573 or 2,574 metres, the Schwarzhorn is Liechtenstein's second-highest summit, after the 2,599-metre Grauspitz.