Maria Adelaide can refer to: Marie Adélaïde of Savoy (1685–1712), wife of Louis, Dauphin of France, Duke of Burgundy Adelaide of Austria (1822–1855), queen consort of Sardinia Infanta Maria Antonia of Portugal (Maria Antonia Adelaide, 1862–1959), daughter of king of Portugal Infanta Maria Adelaide of Portugal (1912–2012), daughter of claimant to Portuguese throne Maria Adelaide Aboim Inglez (1932–2008), Portuguese communist and opponent of the Estado Novo regime Maria Adelaide Amaral (born 1942), Portuguese Brazilian playwright, screenwriter and novelist Maria Adelaide Lima Cruz (1908–1985), Portuguese painter and theatrical designer Maria Adelaide Sneider (1937–1989), Italian mathematician
See also Maria Adelaide Aglietta (1940–2000), Italian politician Maria Adelaide Amaral (born 1942), Brazilian writer Maria Adelaide Ferreira (born 1959), Portuguese singer Nina Ricci (designer) (born Maria Adélaide Nielli, 1883–1970), Italian-born French fashion designer Maria Adelaide Sneider (1937–1989), Italian mathematician