Violant or Violante of Aragon, also known as Yolanda of Aragon, was Queen consort of Castile and León from 1252 to 1284 as the wife of King Alfonso X of Castile.

Alfonso X was King of Castile, León and Galicia from 30 May 1252 until his death in 1284. During the election of 1257, a dissident faction chose him to be king of Germany on 1 April. He renounced his claim to Germany in 1275, and in creating an alliance with the Kingdom of England in 1254, his claim on the Duchy of Gascony as well