Dom Sebastian Gabriel of Bourbon and Braganza, (Rio de Janeiro, 4 November 1811 – Pau, 14 February 1875) Infante of Portugal and Spain, was an Iberian prince of the 19th century, progenitor of the Spanish ducal lines of Hernani, Ansola, Dúrcal and Marchena, and Carlist army commander in the First Carlist War.