| Type: | Bishop |
| Honorific-Prefix: | Most Reverend |
| Francisco Diego Díaz de Quintanilla y de Hevía y Valdés | |
| Bishop of Antequera, Oaxaca | |
| Church: | Catholic Church |
| Diocese: | Diocese of Antequera |
| Term: | 1655–1656 |
| Predecessor: | Bartolomé de Benavente y Benavides |
| Successor: | Juan Alonso de Cuevas y Davalos |
| Consecration: | 8 January 1640 |
| Consecrated By: | Mauro Diego de Tovar y Valle Maldonado |
| Birth Date: | 4 October 1587 |
| Birth Place: | Oviedo, Spain |
| Death Date: | 6 December 1656 (age 69) |
| Death Place: | Antequera, Oaxaca, México |
| Previous Post: | Bishop of Durango (1639–1655) |
| Nationality: | Spanish |
Francisco Diego Díaz de Quintanilla y de Hevía y Valdés, O.S.B. (4 October 1587 – 6 December 1656) was a Roman Catholic prelate who served as Bishop of Antequera, Oaxaca (1655–1656) and Bishop of Durango (1639–1655).
Francisco Diego Díaz de Quintanilla y de Hevía y Valdés was born in Oviedo, Spain on 4 October 1587 and ordained a priest in the Order of Saint Benedict.[1] [2] On 8 August 1639, he was appointed during the papacy of Pope Urban VIII as Bishop of Durango.On 8 January 1640, he was consecrated bishop by Juan de Palafox y Mendoza, Bishop of Tlaxcala, with Cristóbal Pérez Lazarraga y Maneli Viana, Bishop of Chiapas, and Mauro Diego de Tovar y Valle Maldonado, Bishop of Caracas, serving as co-consecrators. On 14 May 1655, he was appointed during the papacy of Pope Alexander VII as Bishop of Antequera, Oaxaca.He served as Bishop of Antequera, Oaxaca until his death on 6 December 1656.
While bishop, he was the principal consecrator of Pedro de Barrientos Lomelin, Bishop of Durango (1656); and Juan de Montiel, Bishop of Santiago de Cuba (1656).