Prince Sigismund of Prussia (Wilhelm Viktor Karl August Heinrich Sigismund; 27 November 1896 at Kiel – 14 November 1978 at Puntarenas, Costa Rica), was the second son of Prince Henry of Prussia and his wife, Princess Irene of Hesse and by Rhine. He was a nephew of Kaiser Wilhelm II and Tsarina Alexandra of Russia and a great-grandson of Queen Victoria through both his parents.

On 11 July 1919 at Hemmelmark, he married Princess Charlotte of Saxe-Altenburg (4 March 1899 – 16 February 1989), eldest daughter of Ernst II, Duke of Saxe-Altenburg. They had two children:

In 1927, Prince Sigismund and his family resettled in Costa Rica. He planned to engage in banana and coffee planting on land he owned there. They were accompanied by only a governess, as the children were still young.

Sigismund died in Puntarenas on 14 November 1978.

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