| Consort: | yes |
| Princess Marie Louise | |
| Succession: | Duchess consort of Saxe-Altenburg |
| Reign: | 30 November 1848 – 3 August 1853 |
| Full Name: | German: Marie Luise Friederike Alexandrine Elisabeth Charlotte Catherine |
| House: | Mecklenburg-Schwerin |
| Father: | Frederick Louis, Hereditary Grand Duke of Mecklenburg-Schwerin |
| Mother: | Grand Duchess Elena Pavlovna of Russia |
| Birth Date: | 31 March 1803 |
| Birth Place: | Ludwigslust Palace, Ludwigslust, Duchy of Mecklenburg-Schwerin, Holy Roman Empire |
| Death Place: | Elisabethenburg Palace, Meiningen, Duchy of Saxe-Meiningen, German Confederation |
Duchess Marie Louise of Mecklenburg-Schwerin (German: Herzogin Marie Luise Friederike Alexandrine Elisabeth Charlotte Catherine Mecklenburg-Schwerin; 31 March 180326 October 1862) was the Duchess of Saxe-Altenburg. She was daughter of Frederick Louis, Hereditary Grand Duke of Mecklenburg-Schwerin, and Grand Duchess Elena Pavlovna of Russia. In 1825, she married Georg, Duke of Saxe-Altenburg, and became his consort.
Marie Louise was born on 31 March 1803, in the Ludwigslust Palace in Ludwigslust, Mecklenburg-Schwerin. She was the second child and first daughter of Frederick Louis, Hereditary Grand Duke of Mecklenburg-Schwerin (1778–1819), and his wife, Grand Duchess Elena Pavlovna of Russia (1784–1803). Frederick Louis was the son of Frederick Francis I, Grand Duke of Mecklenburg-Schwerin, and Princess Louise of Saxe-Gotha-Altenburg, while Elena Pavlovna was the daughter of Paul I of Russia and Duchess Sophie Dorothea of Württemberg.
On 7 October 1825 in Ludwigslust, at the age of twenty-two, Marie Louise married twenty-nine-year-old Georg, Duke of Saxe-Altenburg. Georg was the son of Frederick, Duke of Saxe-Altenburg, and his wife, Duchess Charlotte Georgine of Mecklenburg-Strelitz. The newly-wedded couple would live in Charlottenburg Palace in Hildburghausen until 1829.
The marriage was, reportedly, very happy. The local superintendent Klötzner said: "[...] in his love for his wife and sons, he was the model of a real family man."[1]
They had three children:
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