Prince Felix Salm-Salm (1828–1870) was a Prussian military officer of noble birth and a soldier of fortune. Salm-Salm served in the Schleswig-Holstein Army (Prussian Army), Austrian Army, the Union Army during the American Civil War, the army of Emperor Maximilian I in Mexico and thereafter in the Prussian Army. He was killed in action during the Franco-Prussian War.