Princess Marie Luise Alexandra Karoline of Hohenzollern-Sigmaringen, later Countess of Flanders, was a princess of Hohenzollern-Sigmaringen, later simply of Hohenzollern. She married Prince Philippe, Count of Flanders, second son of King Leopold I of Belgium, and she was the mother of King Albert I.

Prince Philippe of Belgium, Count of Flanders, was the third born and second surviving son of King Leopold I of Belgium and Louise d'Orléans. He was the brother of Leopold II of Belgium and Empress Carlota of Mexico.