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Louis IX of Hesse-Darmstadt (German: Ludwig) (15 December 1719 – 6 April 1790) was Landgrave of Hesse-Darmstadt from 1768 to 1790.

After his military service in the army of Frederick the Great, Louis was involved in freemasonry and interested theosophy and alchemy. He corresponded with Emanuel Swedenborg in 1771, as Swedonborg hoped that Louis would take over leadership of Swedish Rite freemasonry in Germany.

As of 2025, Louis, along with his wife Caroline, are the most recent common ancestors of all currently reigning hereditary monarchs in Europe.

Caroline of the Palatinate-Zweibrücken (Caroline Henriette Christiane Philippine Louise; 9 March 1721 – 30 March 1774) was Landgravine of Hesse-Darmstadt by marriage to Louis IX, Landgrave of Hesse-Darmstadt. She was famed as one of the most learned women of her time and known as The Great Landgräfin.

Together with Louis IX, her husband, she became the most recent common ancestors of all current sovereigns of hereditary monarchies in Europe in 2022 after Charles III became King of the United Kingdom.