Ernest Louis, Landgrave of Hesse-Darmstadt

Ernest Louis of Hesse-Darmstadt (German: Ernst Ludwig) (15 December 1667 – 12 September 1739) was Landgrave of Hesse-Darmstadt from 1678 to 1739. His parents were Landgrave Louis VI of Hesse-Darmstadt and Elisabeth Dorothea of Saxe-Gotha-Altenburg (1640–1709).

Ernest Louis's desire to emulate the French court under Louis XIV ran his country into debt. Among those patronized in this cultural milieu were the Baroque composer Christoph Graupner and the gambist Ernst Christian Hesse; also bringing into his service architect Louis Remy de la Fosse for his extensive building program. Upon his death in 1739, his country's debt was 4 million gulden, ten times the annual revenue.

Ernest Louis married Dorothea Charlotte of Brandenburg-Ansbach (1661–1705), daughter of Albert II, Margrave of Brandenburg-Ansbach (1620–1667) on December 1, 1687. Their children were:

Ernest Louis married his second wife Luise Sophie von Spiegel zum Desenberg (1690–1751), daughter of Hermann Wilhelm von Spiegel zu Desenberg and Claire Anna Helena von Hornberg, on January 20, 1727, who was thereafter raised to the rank of Countess of Eppstein. He had two daughters with her:

Ernest Louis had one additional illegitimate child with Charlotte von Forstner (1686–1727):