Schwarzburg-Sondershausen was a small principality in Germany, in the present day state of Thuringia, with its capital at Sondershausen.

In that year, it became a principality, which lasted until the fall of the German monarchies in 1918, during the German Revolution of 1918–1919.

After the German Revolution, it became a republic and joined the Weimar Republic as a constituent state.

Towns placed in the state were: Arnstadt, Sondershausen, Gehren, Langewiesen, Großbreitenbach, Ebeleben, Großenehrich, Greußen and Plaue.

Raised to Principality in 1697 United under Prince Günther Victor of Schwarzburg-Rudolstadt