Justin of Chieti was an early Catholic bishop serving the community of Chieti, Italy. While his exact date of death remains uncertain, historical accounts suggest he may have lived during the 3rd, 4th, or 6th centuries. Although his existence is not documented in records prior to the 15th century, he is traditionally honored as a saint. His later biographical accounts, known as a passio, were influenced by the life of a different bishop of the same name and include his relatives, Florentius, Felix, and Justa.