| Honorific-Prefix: | Most Reverend |
| Juan de San Millán | |
| Bishop of León | |
| Church: | Catholic Church |
| Diocese: | Diocese of León |
| Term: | 1564–1578 |
| Predecessor: | Andrés de la Cuesta |
| Successor: | Francisco Trujillo García |
| Birth Date: | 1497 |
| Birth Place: | Barrionuevo, Spain |
| Death Date: | 11 April 1578 (age 81) |
| Death Place: | León, Spain |
| Previous Post: | Bishop of Tui (1547-1564) |
| Nationality: | Spanish |
Juan de San Millán (1497 – 11 April 1578) was a Roman Catholic prelate who served as Bishop of León (1564–1578) and Bishop of Tui (1547–1564).[1]
Juan de San Millán was born in Barrionuevo, Spain.[2] [3] On June 1547, he was appointed during the papacy of Pope Paul III as Bishop of Tui. On 28 Jul 1564, he was appointed during the papacy of Pope Pius IV as Bishop of León. He served as Bishop of León until his death on 11 April 1578.