| Louis V | |
| Succession: | Landgrave of Hesse-Darmstadt |
| Reign: | 7 February 1596 – 27 July 1626 |
| Predecessor: | George I |
| Successor: | George II |
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| Issue-Pipe: | more... |
| House: | Hesse-Darmstadt |
| Father: | George I, Landgrave of Hesse-Darmstadt |
| Mother: | Magdalene of Lippe |
| Birth Date: | 24 September 1577 |
| Birth Place: | Darmstadt, Landgraviate of Hesse-Darmstadt |
| Death Date: | 27 July 1626 (aged 48) |
| Death Place: | near Rheinfels |
Louis V of Hesse-Darmstadt (German: Ludwig; 24 September 1577 - 27 July 1626) was the Landgrave of Hesse-Darmstadt from 1596 to 1626.
He was born on 24 September 1577 as the son of George I, Landgrave of Hesse-Darmstadt and Magdalene of Lippe, daughter Bernhard VIII, Count of Lippe.
In 1604 he inherited a part of Hessen-Marburg after the death of Louis IV of Hesse-Marburg who was childless. The other half went to Maurice of Hesse-Kassel (or Hesse-Cassel), but since Maurice was a Calvinist, Ludwig claimed a right on the whole of Hesse-Marburg. Lutheran professors of the University of Marburg who refused to convert to Calvinism founded in 1607 the University of Gießen which was named Ludoviciana.
This led to a conflict during the Thirty Years' War, between Louis V, who stood on the side of the Emperor, and Maurice, who was on the side of the Protestants. Hesse-Darmstadt suffered severely from the ravages from the Swedes during the conflict.
The Landgrave died in 1626 and he was succeeded by George II, Landgrave of Hesse-Darmstadt.
In 1722, Johann Georg Liebknecht, an astronomer at the University of Gießen, named a star, which he thought was a planet, Sidus Ludoviciana after Ludwig V.
Louis V married Magdalene of Brandenburg, daughter of John George, Elector of Brandenburg by his third wife, Elisabeth of Anhalt-Zerbst. They had issue:
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