Julian the Ecclesiastical Writer was a Christian author who lived in the late Roman Empire, around the 4th or 5th century CE. Almost nothing is known about his personal life, including his birthplace or role within the church. He is identified by this specific title to avoid confusion with more famous historical figures named Julian, such as the emperor. His entire known legacy comes from a single surviving work.

That work is a theological treatise titled Adversus Judaeos ("Against the Jews"). It belongs to a common style of early Christian literature that sought to debate Jewish beliefs and interpret Hebrew scripture from a Christian perspective. According to modern scholars, the text's importance lies in its value as a source for understanding the methods of religious debate and scriptural analysis in late antiquity. While the author himself remains obscure, his treatise provides a specific example of the polemical arguments that characterized Christian-Jewish relations during this formative period.