 María de Barrenechea, 1st Duchess of Dato

María del Carmen de Barrenechea y Montegui, 1st Duchess of Dato (19 June 1860 – 1 October 1925) was a Spanish noblewoman and wife of the Eduardo Dato e Iradier, Prime Minister of Spain.She was of Basque descent, a daughter of Juan José de Barrenechea y Urdampilleta and wife Micaela Montegui y Mercaide, patrilineal granddaughter of Pedro de Barrenechea y Zubea and wife María Ignacia de Urdampilleta y Lagarto, and matrilineal granddaughter of José Manuel Montegui and wife María de la Concepción Mercaide.