| Charles Gonthier | |
|---|---|
 | |
| Prince of Schwarzburg-Sondershausen | |
| Reign | 17 July 1880 – 28 March 1909 |
| Predecessor | Gonthier Frederick Charles II |
| Successor | Günther Victor |
| Born | 7 August 1830 Arnstadt |
| Died | 28 March 1909 (aged 78) Dresden |
| Spouse | Princess Marie Gasparine of Saxe-Altenburg |
| House | House of Schwarzburg |
| Father | Gonthier Frederick Charles II, Prince of Schwarzburg-Sondershausen |
| Mother | Princess Marie of Schwarzburg-Rudolstadt |
| Religion | Christianity |
Charles Gonthier, Prince of Schwarzburg-Sondershausen (German: Karl Günther, Fürst von Schwarzburg-Sondershausen; 7 August 1830 – 28 March 1909) was the ruler of the principality of Schwarzburg-Sondershausen, a constituent state of the German Empire, and head of the House of Schwarzburg from 17 July 1880 until his death.