Cristóbal de Haro was a Castilian financier and merchant, famous for having provided funding for the Magellan-Elcano expedition.
Born in Burgos, Haro was based in Lisbon since 1505. After 1513, he became upset with the Portuguese crown and returned to Castile, plotting with Portuguese exiles Ferdinand Magellan and Ruy Faleiro and with the Spanish minister Juan Rodríguez de Fonseca an expedition to the Spice Islands sailing westward.
As a financier and representative of the Welsers he provided a quarter of the financial backing to Magellan's 1519 voyage, which failed to conquer the Spice Islands but resulted in the first circumnavigation around the world by Juan Sebastián Elcano.
Cristóbal's brother Jacobo de Haro headed a commercial firm based in Antwerp. A daughter of Jacobo, Frances, was married to Maximilianus of Transylvania, who wrote the first account of Magellan's voyage, published in 1523. Transylvanus pointed out that Cristóbal de Haro had assisted Magellan and Faleiro considerably in presenting their proposals before the Spanish royal counselors.