Frederick Karl

Frederick Karl may refer to:


 * Frederick R. Karl (1927–2004), literary biographer
 * Frederick B. Karl (1924–2013), American politician
 * Prince Friedrich Karl of Prussia (1828–1885), Prussian prince and military commander during the wars of German unification
 * Prince Friedrich Karl of Prussia (1893–1917), German prince and competitive horse rider in the 1912 Olympics