|Grand Duke of Hesse and by Rhine|
|Reign||5 March 1848 – 13 June 1877|
|Born||9 June 1806|
|Died||13 June 1877 (aged 71)|
|Spouse||Princess Mathilde Caroline of Bavaria|
Baroness Magdalen of Hochstadten (morganatic)
|Father||Louis II, Grand Duke of Hesse|
|Mother||Wilhelmine of Baden|
Louis III, Grand Duke of Hesse and by Rhine (German: Großherzog Ludwig III von Hessen und bei Rhein; 9 June 1806, Darmstadt – 13 June 1877, Seeheim) was Grand Duke of Hesse and by Rhine from 1848 until his death in 1877.
He was the son of Grand Duke Louis II of Hesse and his consort Wilhelmine of Baden. He succeeded as Grand Duke in 1848 upon the abdication of his father during the March Revolution in the German states.
During the Austro-Prussian War of 1866, Louis sent word more than once to Queen Victoria, mother-in-law of his nephew and successor Louis, appealing to her to reason on his behalf with the King of Prussia, "in the same sense I had already written before, but it would be utterly useless."
In Munich, on 26 December 1833, he married Princess Mathilde Caroline of Bavaria, eldest daughter of Ludwig I of Bavaria. The marriage produced no children. Princess Mathilde Caroline died in 1862, and in 1868 the Grand Duke remarried, morganatically, to Magdalene Appel who was created Baroness of Hochstädten.
- "Queen Victoria's Journals". Princess Beatrice's copies. RA VIC/MAIN/QVJ(W). 15 May 1866.
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Louis III, Grand Duke of HesseBorn: 9 June 1806 Died: 13 June 1877
| Grand Duke of Hesse and by Rhine