Mary Adelaide may refer to: Mary Adelaide Dickey (1882–1960), American vaudeville performer Mary Adelaide Eden Phillpotts, birth name of Adelaide Phillpotts (1896–1993), English novelist, poet, and playwright Mary Adelaide Hare (1865–1945), English teacher of deaf children, and suffragist Mary Adelaide Nutting (1858–1948), Canadian nurse, educator, and pioneer Mary Adelaide Virginia Thomasina Eupatoria FitzPatrick, birth name of Patsy Cornwallis-West (1854–1920), Irish aristocrat and mistress of King Edward VII Mary Adelaide Walker, 19th-century English writer Princess Mary Adelaide of Cambridge (1833–1897), later Duchess of Teck, by marriage Princess Marie Adélaïde of France (1732–1800), daughter of Louis XV Marie-Adélaïde, Grand Duchess of Luxembourg (1894–1924), sovereign of Luxembourg Marie Adélaïde of Savoy (1685–1712), mother of Louis XV