Dona Isabel, Duchess of Braganza (née Isabel Inês Castro Curvelo de Herédia; born 22 November 1966), is a Portuguese businesswoman, noblewoman, and the wife of Duarte Pio, Duke of Braganza, the current pretender to the defunct Portuguese throne. Born to descendants of Portuguese nobility, Castro Curvelo de Heredia worked as an assets manager prior to her marriage.

Since becoming the Duchess of Braganza, Isabel has left the professional world, devoted her attention to her family, and become patron to several Portuguese charities and non-profit foundations. She and the Duke have had three children together, thus securing the continuation of the House of Braganza.

Isabel Inês Castro Curvelo de Herédia was born on 22 November 1966, in Lisbon, to Dom Jorge de Heredia, an architect, and Dona Raquel Leonor Pinheiro de Castro Curvelo, his wife. Since birth, she was entitled to the honorific styling of Dona (Lady), being a descendant in the male lineage of Francisco Correia de Herédia, 1st Viscount of Ribeira Brava, of the Portuguese nobility, and a famed republican, who was involved in the failed republican uprising of 28 January 1908.

Castro Curvelo de Heredia lived between metropolitan Portugal and Portuguese Angola until 1975, when Angola was granted independence. Her family subsequently moved to São Paulo, Brazil. There, she studied at the Colégio São Luís, a Jesuit-run institution. In 1990, she obtained a degree in business administration from the Fundação Getúlio Vargas and returned to Portugal to a job in BMF — Sociedade de Gestão de Patrimónios, S.A. She specialized as an asset manager.

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