Princess Isabella of Bavaria (Marie Elisabeth Luise Amalie Elvire Blanche Eleonore; 31 August 1863 – 26 February 1924) was the third child and eldest daughter of Prince Adalbert of Bavaria and his wife Infanta Amelia Philippina of Spain. By her marriage to Prince Thomas, Duke of Genoa, she became referred to as the Duchess of Genoa.

Isabella's father Adalbert was the fourth son of Ludwig I of Bavaria and Therese of Saxe-Hildburghausen. Her mother Amalia was a daughter of Infante Francisco de Paula of Spain, a younger brother of Ferdinand VII of Spain. Her mother was also a sister of Francis, Duke of Cádiz, the consort of Ferdinand VII's daughter Isabella II of Spain.

On April 14 1883 at Nymphenburg, Bavaria, Isabella married Prince Thomas, Duke of Genoa. He was the only son of Prince Ferdinand, Duke of Genoa and his wife Princess Elisabeth of Saxony. He was also a brother-in-law through his sister Margherita of Savoy of Umberto I of Italy, and thus was an uncle of the future King Victor Emmanuel III of Italy. Their union was the fourth time the houses of Wittelsbach and Savoy had been united in marriage.