Eleanor of Aragon (20 February 1358 – 13 August 1382) was a daughter of King Peter IV of Aragon and his wife Eleanor of Sicily.

[1] She was a member of the House of Barcelona and Queen of Castile by her marriage.

[2] Eleanor was the youngest child and only daughter of her father by his third marriage.

At Soria on the 18 June 1375, Eleanor married John I of Castile.

Eleanor's son Ferdinand later claimed his mother's rights on the Kingdom of Aragon when both of Eleanor's brothers died without surviving sons.