Pedro Girón Acuña Pacheco (1423–1466), was Master of the Order of Calatrava (1445–1466), 1st Lord of Ureña and Osuna, and an important political figure at the court of Henry IV of Castile.
He was the younger brother of Juan Pacheco and nephew of Alfonso Carrillo de Acuña, Archbishop of Toledo.
In the trail of his brother, and a confidant of the young prince and later King Henry IV of Castile, he became one of the most powerful and rich persons in the Castilian court.
But when Pedro travelled to Madrid at the head of a 3,000-strong force to negotiate the marriage, he suddenly fell ill and died.
Despite this, he had four children with Inés de las Casas, who were legitimated by Pope Pius II in 1459, with the support of King Henry IV.