María Díaz II de Haro

María Díaz II de Haro (b. c. 1318 or 1320 - d. 16 September 1348) was a Spanish noble of the House of Haro. She was the daughter of Juan de Castilla y Haro and his wife, Isabel of Portugal and was Lady of Biscay from 1334 until her death in 1348.

Daughter of Juan de Castilla y Haro and of Isabel of Portugal, she was the paternal granddaughter of infante John of Castile and of María I Díaz de Haro, Lady of Biscay. Her maternal grandparents were the infante Afonso of Portugal and his wife, Violante Manuel

In 1326, her father was assassinated in Toro by order of King Alfonso XI of Castile who also subsequently confiscated all her father's property. María Díaz II was taken to France where she lived in the city of Bayonne. While at Bayonne, Juan Núñez III de Lara, head of the House of Lara and noble Magnate of the Kingdom of Castile and Leon solicited her hand in marriage. The two were married that same year.

During the first part of the reign of Alfonso XI, her husband Juan Núñez III reclaimed from the king in her name, all properties that had previously belonged to her father. In the process, Juan Núñez III fought against the king on various occasions until his final definitive reconciliation with the king after his being besieged and defeated at Lerma. After the peace between her husband and the king, all parties were able to coexist peacefully with the Castilian-Leonese monarch. Alfonso XI ratified the possession of the Lordship of Biscay as belonging to María Díaz II and promised to not use the title himself in any way, something that he had previously done since 1332.

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