John of Debar (; fl. 1018–1037) was an 11th-century Bulgarian clergyman.C. T. Allmand, David Abulafia, Rosamond McKitterick, 1995, Cambridge University Press, The New Cambridge Medieval History: Volume 4, C.1024-c.1198, Part 2. p. 263.Снегаров, Иван. История на Охридската архиепископия, т.1. Второ фототипно издание. София, Академично издателство "Марин Дринов", 1995, . с. 195.Eduard Mühle, 2023. Slavs in the Middle Ages Between Idea and Reality. Brill, , p. 163. He was a bishop under Emperor Samuel of Bulgaria.The Early Medieval Balkans: A Critical Survey from the Sixth to the Late Twelfth Century, John Van Antwerp Fine, University of Michigan Press, 1991, , p. 199. According to Srđan Pirivatrić he became the last Bulgarian patriarch David in 1016.Пириватрић, Ср. Бугарски патријарх и архиепископ Јован. Почеци манастирске кнјижевности у Охридској Архиепископији. Годишник на Софийския университет, Център за славяно-византийски проучвания „Иван Дуйчев", 13, 2004, стр. 3-5. He remained in office, becoming the first Archbishop of Ohrid, after the fall of the First Bulgarian Empire to Byzantium.Пириватрич, Сърджан. Самуиловата държава. Обхват и характер. София, Издателска група "АГАТА-А", 2000. , с. 197, 233-234 When in 1018 Emperor Basil II managed to conquer Bulgaria, he issued a decree to downgrade the Patriarchate of the Bulgarian Orthodox Church to the Archbishopric of Ohrid, which remained autocephalous and corresponded to the newly formed theme of Bulgaria. John was chosen to be the first Archbishop of Ohrid by Basil II.McKitterick, Rosamond; Abulafia, David; Allmand, C. T. ed. The New Cambridge Medieval History: Volume 4, C.1024-c.1198, Part 2, Cambridge University Press, 1995, , pp. 263–265.Nicolas Oikonomides; Elizabeth Zachariadou, Social and Economic Life in Byzantium, Taylor & Francis, 2013, , p. 318. According to 17th-century French historian Charles du Fresne, John was born in a village around the town of Debar in modern North Macedonia and had been a hegumen in a Debar monastery. Per Bulgarian historian Ivan Snegarov, he was born in the village Agnoandnika in the region of Debar. He remained head of the Archbishopric until his death in 1037.
John of Debar is canonized as a saint by the Bulgarian Orthodox Church as Saint David of Bulgaria and is commemorated on June 26.
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