| Type: | Bishop |
| Honorific-Prefix: | Most Reverend |
| Gregorio de Alarcón | |
| Bishop of Santiago de Cuba | |
| Church: | Catholic Church |
| Diocese: | Diocese of Santiago de Cuba |
| Term: | 1624 |
| Predecessor: | Alonso Orozco Enriquez de Armendáriz Castellanos y Toledo |
| Successor: | Leonel de Cervantes y Caravajal |
| Ordination: | 22 December 1576 |
| Consecration: | July 1624 |
| Consecrated By: | Juan Bravo Lagunas |
| Birth Date: | 1558 |
| Birth Place: | Castillo de Garcimuñoz, Spain |
| Death Date: | August 1624 (age 66) |
| Death Place: | Santiago de Cuba, Spanish Empire |
| Nationality: | Spanish |
Gregorio de Alarcón, O.A.D. (1558 – August 1624) was a Roman Catholic prelate who served as Bishop of Santiago de Cuba (1624).[1]
Gregorio de Alarcón was born in Castillo de Garcimuñoz, Spain in 1558 and ordained a priest in the Ordo Augustiniensium Discalceatorum on 22 December 1576.[2] On 29 April 1624, he was appointed during the papacy of Pope Urban VIII as Bishop of Santiago de Cuba.In July 1624, he was consecrated bishop by Juan Bravo Lagunas, Bishop of Ugento. He served as Bishop of Santiago de Cuba until his death in August 1624.