| Type: | Bishop |
| Diego de Loaysa, CRSA | |
| Bishop of Modruš | |
| Church: | Roman Catholic |
| Diocese: | Diocese of Modruš |
| Appointed: | 11 March 1538 |
| Predecessor: | Pietro Paolo Vergerio |
| Successor: | Filippo Angelo Seragli |
| Term End: | 1549 |
| Honorific-Prefix: | His Eminence |
| Nationality: | Spanish |
| Birth Place: | Granada (Spain) |
Diego de Loaysa, CRSA was a prelate of the Roman Catholic Church. He served as bishop of the Roman Catholic Diocese of Modruš, Croatia, from 1538 until 1549.[1]
He was known for consecrating the famous Dominican friar, social reformer and bishop Bartolomé de las Casas.