Prince Joachim Viktor Wilhelm Leopold Friedrich Sigismund of Prussia (17 December 1891 – 6 July 1927) was a German World War I fighter pilot and member of the House of Hohenzollern as the son of Prince Friedrich Leopold of Prussia and Princess Louise Sophie of Schleswig-Holstein-Sonderburg-Augustenburg.

On 27 April 1916, he married at Jagdschloss Klein-Glienicke in Berlin Princess Marie Louise of Schaumburg-Lippe (b.

10 February 1897, Oldenburg - d. 1 October 1938, Potsdam) (a daughter of Prince Friedrich of Schaumburg-Lippe and Princess Louise of Denmark).

They had two children:[3] He and his wife were great lovers of riding and horses, and he was considered one of the best horsemen in Germany.

[3][5] Before he was able to free himself, the horse trod his chest multiple times, breaking five ribs and causing other injuries.