Giovanni Antonio Astorch or Giovanni Antonio Astorco (died 1567) was a Roman Catholic prelate who served as Bishop of Lettere-Gragnano (1565âÂÂ1567).
On 7 November 1565, Giovanni Antonio Astorch was appointed during the papacy of Pope Pius IV as Bishop of Lettere-Gragnano. He served as Bishop of Lettere-Gragnano until his death in 1567. While bishop, he was the principal co-consecrator of Felice Peretti Montalto, Bishop of Sant'Agata de' Goti (1567).