Princess Marie of Hohenzollern-Sigmaringen, later Princess Marie of Belgium, Countess of Flanders (Marie Luise Alexandrine Karoline; 17 November 1845 – 26 November 1912) was a Princess of Hohenzollern-Sigmaringen, later simply of Hohenzollern, and mother of King Albert I of Belgium.

Marie Luise was a daughter of Prince Karl Anton of Hohenzollern-Sigmaringen, Prime minister of Prussia and Princess Josephine of Baden, and as such a sister of Carol I of Romania and aunt of his successor, Ferdinand of Romania.

Marie was considered as a potential wife to the future Edward VII of the United Kingdom. Though she was considered "quite lovely" by his family, her Roman Catholic religion barred her from being a suitable consort. She married on 25 April 1867 in Berlin with Prince Philippe, Count of Flanders, second son of King Leopold I of Belgium and Louise-Marie of Orléans.

They had 5 children:

Princess Marie was an accomplished artist, even occasionally exhibiting her paintings at the Brussels Fair. She had a literary salon, which was the gathering place of many authors as well as a feature of Brussels social life for forty years. She also demonstrated appreciation for music, on one occasion awarding a gold medal to the Zoellner Quartet after it performed for the Belgian royalty.

Marie Luise died in Belgium in 1912 at the age of 67, after suffering from pneumonia for several days. She was buried in the Church of Our Lady of Laeken.

Her full style and title was Her Royal Highness Marie, Princess Philippe of Belgium, Countess of Flanders, Princess of Saxe-Coburg and Gotha, Duchess in Saxony.

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