John of Castile, Lord of Valencia de Campos

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Infante John
Lord of Valencia de Campos Consort Lord of Biscay
Coat of Arms of Infante John of Castile.
Born	15 May/25 July 1260 Seville
Died	25 June 1319 (aged 58–59) Pinos Puente
Burial	Burgos Cathedral
Spouse	Margaret of Montferrat María II Díaz de Haro
Issue	Alfonso, Lord of Valencia de Campos Juan el Tuerto Lope Díaz de Haro María Díaz de Haro
House	Castilian House of Ivrea
Father	Alfonso X of Castile
Mother	Violant of Aragon

John of Castile, called the "el de Tarifa" (Spanish: Juan de Castilla "el de Tarifa"; 1262–25 June 1319) was an infante of Castile and León. He was engaged in a decades-long fight for control over the Lordship of Biscay with Diego López V de Haro, the uncle of his wife.