Juan de Castilla y Haro

Juan de Castilla y Haro
Lord of Cuéllar and Biscay
Arms of the House of Haro
Died(1326-11-01)1 November 1326
Toro, Zamora
Noble familyCastilian House of Ivrea
SpouseIsabel of Portugal
IssueMaría Díaz II de Haro
FatherJohn of Castile
MotherMaría II Díaz de Haro

Juan de Castilla y Haro, most commonly known as Juan el Tuerto (the one-eyed) (b. ? - d. 1 November 1326, Toro), was a Spanish noble of the House of Haro and of the royal line of the Kingdom of Castile descended from Alfonso X of Castile. He was the Lord of Cuéllar from 1319 to 1325 and the Lord of Biscay from 1322 until his assassination by order of King Alfonso XI of Castile in 1326.