John of Trogir was an 11th-century Benedictine monk and Catholic bishop who served the city of Trogir. Originally a member of the monastery of Saint Peter in Osor, he was appointed to his episcopal position by Laurentinus, the Archbishop of Split, following a request from the local citizens. Throughout his tenure, his name was recorded in various charters belonging to Croatian kings. He is remembered for his diplomatic efforts, specifically for intervening in 1105 to prevent King Coloman of Hungary from destroying the city during a succession conflict.