Prince Friedrich Karl of Prussia (Tassilo Wilhelm Humbert Leopold Friedrich Karl; 6 April 1893 – 6 April 1917) was a German prince and competitive horseman who competed in the 1912 Summer Olympics.

[1] Prince Friedrich Karl was born in Schloss Klein-Glienicke, Potsdam, Berlin.

He was the son of Prince Friedrich Leopold of Prussia (1865–1931) and Princess Louise Sophie of Schleswig-Holstein-Sonderburg-Augustenburg (1866–1952) and a grandson of Prince Frederick Charles of Prussia.

During one such patrol, on 21 March 1917, he was forced to land because of a bullet in his engine and with a slight wound to his foot.

[3] He was taken into captivity, where he died from his injuries on 6 April 1917 (his 24th birthday) at Saint-Étienne-du-Rouvray.