Marie Adelaide may refer to:
- Marie-Adélaïde, Grand Duchess of Luxembourg (1894–1924), reigned 1912–1919
- Princess Marie Adélaïde of Savoy (1685–1712), Duchess of Burgundy and Dauphine of France
- Princess Marie Adélaïde of France (1732–1800), daughter of King Louis XV
- Louise Marie Adélaïde de Bourbon (1753–1821), Duchess of Orléans, and mother of King Louis Phillipe I
- Princess Marie Adelaide of Luxembourg (1924–2007)
- Princess Adélaïde of Orléans (1777–1847), one of the twin daughters of King Louis Philippe
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