Dom Duarte Pio, Duke of Braganza (born 15 May 1945) is the pretender to the former Portuguese throne, as the head of the House of Braganza. The Miguelist Braganzas, to whom Duarte Pio belongs as great-grandson of King Miguel I, is a cadet branch of the House of Braganza. With the extinction of male-line dynasts descended from Queen Maria II in 1932, King Miguel's descendants became the only male-line Braganzas left and the closest male-line heirs to the Portuguese throne (the Brazilian branch having gone extinct in 1921).

Duarte Pio is a figure within the European network of royal houses, often being invited to various foreign royal events. Despite his support for a monarchical government and widespread recognition as heir to the throne, there are no serious movements or parties that support restoration of the monarchy.

In 1995, the Duke married Isabel Inês de Castro Curvelo de Herédia, a Portuguese businesswoman and descendant of Portuguese nobility. Their marriage was the first marriage of a Portuguese royal to happen in Portuguese territory since the marriage of King Carlos I, Duarte Pio's second cousin once removed, and Princess Amélie of Orléans, in 1886. The Duke and Duchess have three children, thus continuing the line of the Braganzas, as neither of the Duke's brothers have married nor had children.

Duarte Pio João Miguel Gabriel Rafael was born on 15 May 1945 in Bern, Switzerland, as the first of three sons of Duarte Nuno, Duke of Braganza, and Maria Francisca of Orléans-Braganza. His father was the grandson of King Miguel I, while his mother was a great-granddaughter of King Pedro IV (Emperor Pedro I of Brazil), who was King Miguel I's older brother. Through his father, he is a member of the Miguelist branch of the House of Braganza. Duarte Pio's godparents were Pope Pius XII, Queen Amélie (the mother of King Manuel II, the last monarch of Portugal) and his great-aunt Infanta Adelgundes, Duchess of Guimarães. From his birth, Duarte Pio has held the honorific styling of Dom (Lord) and the styling of His Royal Highness and, until the death of his father, he held the titles of Prince of Beira and Duke of Barcelos.

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