Günther Victor (21 August 1852 – 16 April 1925) was the final sovereign prince of Schwarzburg-Rudolstadt and Schwarzburg-Sondershausen.

He was born in Rudolstadt the son of Prince Adolf of Schwarzburg-Rudolstadt (1801–1875) and his wife Princess Mathilde of Schönburg-Waldenburg (1826–1914).

Following the death of his father on 1 July 1875 Prince Günther became the heir presumptive to the principality of Schwarzburg-Rudolstadt.

This was the first time the two principalities had been united under the same ruler since the 16th century when the Sondershausen and Rudolstadt lines had been formed.

Following his death in Sondershausen in the spring of 1925, he was succeeded as head of the House of Schwarzburg by Prince Sizzo.