Blanche II of Navarre (Basque: Zuria), titular queen of Navarre, was the daughter of John II of Aragon and Blanche I of Navarre. She was also Princess of Asturias by marriage.
In 1427, she, her brother Charles, and her sister Eleanor, were proclaimed the rightful heirs of the kingdom of Navarre. Blanche was promised to the heir of Castile in the peace treaty between Navarre and Castile in 1436. She married Henry IV of Castile in 1440. The marriage was reputedly never consummated.
After the death of her brother in 1461, some Navarrese dissatisfied elements and some of the anti-Aragonese party regarded Blanche as the rightful monarch, as they had regarded Charles. They proclaimed her queen. She would have thus become Blanche II of Navarre, had not her father (who wanted to keep the government of Navarre) already had her incarcerated and thus not capable to act.
John tried to marry her to Charles, Duke of Berry, and younger brother of Louis XI of France to make an alliance, but Blanche refused, and her act irritated her father John. In 1464, she came back to Pamplona with the help of its bishop Nicolas de Etchabarri, murdered shortly after, in order to attend the Courts of Navarre.
She died by poison in Orthez less than a month later. Both her father and her sister Eleanor are suggested to have been responsible for her death. Upon her death, her rights to Navarre were inherited by her next sister, Eleanor of Aragon, Countess of Foix, who however was their father's ally and supporter, and did not press her own claims until his death in 1479.