María del Carmen Dato, 3rd Duchess of Dato  María del Carmen Dato y Barrenechea, 3rd Duchess of Dato (6 December 1885 – 18 May 1938), was a Spanish noblewoman. Born in Madrid on 6 December 1885, she was the second of three daughters of Eduardo Dato e Iradier (A Coruña, 12 August 1856 – assassinated in Madrid, 8 March 1921), three times Spanish Prime Minister (or President of the Minister's Council) and wife María del Carmen de Barrenechea y Montegui, 1st Duchess of Dato (- Madrid, 1926). She died on 18 May 1938. She inherited the title after her sister Isabel Dato y Barrenechea, 2nd Duchess of Dato's death. She married Eugenio Espinosa de los Monteros y Bermejillo, and had two sons: Eduardo, Jose Luis, Carlos, Maria Teresa, Javier and Paloma