圣金口若望（希腊语：Ιωάννης Χρυσόστομος，英语发音：/ˈkrɪsəstəm, krɪˈsɒstəm/，347年－407年，或译约翰一世），正教会的君士坦丁堡牧首，重要的基督徒早期教父。若望一世以其出色的演讲与雄辩能力，对当政者与教会内部滥用职权的谴责、与严格的苦行而闻名于世。后世人称其为“金口”（希腊语：χρυσόστομος，中文音译为「屈梭多模」，意为「金口」），以赞誉其口才。

圣金口若望是重要的希腊教父，被许多教会封为圣人。东方正教会与东仪天主教会中，他与圣额我略·纳齐安和该撒利亚的圣巴西略一同被尊为三圣教父。东方正教会与罗马天主教都将其列为教会圣师之一。

John Chrysostom (/ˈkrɪsəstəm, krɪˈsɒstəm/; Greek:Ἰωάννης ὁ Χρυσόστομος), c. 349 – 407, Archbishop of Constantinople, was an important Early Church Father. He is known for his preaching and public speaking, his denunciation of abuse of authority by both ecclesiastical and political leaders, the Divine Liturgy of St. John Chrysostom, and his ascetic sensibilities. The epithet Χρυσόστομος (Chrysostomos, anglicized as Chrysostom) means "golden-mouthed" in Greek and denotes his celebrated eloquence.