Mary Adelaide may refer to:
- Princess Mary Adelaide of Cambridge (1833–1897), later Duchess of Teck, by marriage
- Princess Marie Adélaïde of France (1732–1800), daughter of Louis XV of France
- Marie-Adélaïde, Grand Duchess of Luxembourg (1894–1924), Sovereign of Luxembourg
- Princess Marie-Adélaïde of Savoy (1685–1712), mother of Louis XV of France
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