Jullio del Carretto (died 13 October 1614) was a Roman Catholic prelate who served as Bishop of Casale Monferrato (1594–1614). ^[1] According to Giuseppe Cappelletti, his first name (as his tombstone indicates) was Tullio, not Jullio.^[2]

On 13 July 1594, Jullio del Carretto was appointed Bishop of Casale Monferrato by Pope Clement VIII.^[1] On 25 July 1594, he was consecrated bishop by Girolamo Bernerio, Bishop of Ascoli Piceno, with Guillaume de St-Marcel d'Avançon, Archbishop of Embrun, and Marco Antonio Salomone, Bishop of Sora, serving as co-consecrators.^[1] He served as Bishop of Casale Monferrato until his death on 13 October 1614.^[1] While bishop, he was the principal co-consecrator of Girolamo Palazzuoli, Bishop of Isola (1610); Giambattista Brivio, Bishop of Cremona (1610); and Pietro Bastoni, Bishop of Umbriatico (1611).^[1]

• Catholic Church in Italy

• Bosio, Antonio (1863). Cenni biografici sopra il venerabile servo di Dio Tullio del Carretto di Millesimo, vescovo di Casale (in Italian). (Savona: tip. Vescovile di Miralta 1863).
• Constitutiones Tullii Carretti, episcopi Casalen. In prima dioecesana Synodo promulgatae anno Domini 1597, iiij septembris. (Casale: Bernardus Grassi 1597).

• Cheney, David M. "Diocese of Casale Monferrato". Catholic-Hierarchy.org. Retrieved January 4, 2019. (for Chronology of Bishops) ^{[self-published]}
• Chow, Gabriel. "Diocese of Casale Monferrato (Italy)". GCatholic.org. Retrieved January 4, 2019. (for Chronology of Bishops) ^{[self-published]}