Ernst, Prince of Leiningen (German: Ernst Leopold Victor Carl August Joseph Emich, Furst zu Leiningen; 9 November 1830 – 5 April 1904) was a German nobleman who served with distinction in the British Royal Navy.

He was the elder son of Carl, Prince of Leiningen and Countess Marie von Klebelsberg.

[4] Upon his father's death on 13 November 1856, Ernst Leopold acceded to the title of Prince of Leiningen.

He also inherited the memberships of the upper houses of the parliaments of Bavaria, Hesse and by Rhine and Baden, his family having owned estates and lands in those states.

In 1863, he was nominated as a candidate for the throne of Greece by the British government under Henry Temple, Viscount Palmerston, but declined it; the throne was eventually accepted by Prince William of Denmark, who reigned as King George I until 1913.