Juan de Castilla y Haro, most commonly known as Juan el Tuerto, 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.
- Occupation
- aristocrat, military personnel
- Position held
- Ensign of the Royal Banner of Castile, Adelantado mayor de la frontera de Andalucía
- Citizenship
- Crown of Castile
- Born
- 1293
- Died
