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