John of Patmos is the name given to the author of the Book of Revelation (or Book of the Apocalypse) in the New Testament. According to the text of Revelation, the author, who gives his name as "John", is living in exile on the Greek island of Patmos. In Revelation, he writes to the seven Christian churches in Asia to relate two apocalytic visions he has had. He is sometimes known as the "Eagle of Patmos".

John of Patmos is often referred to as John the Divine, in reference to the divination he received which constitutes Revelation. Indeed the full title of the Book of Revelation is The apocalypse of Saint John the Divine, with apocalypse simply being a greek word for revelation, and Divine an old usage meaning one who

Traditionally, it has been believed that John of Patmos, the author of Revelation, was the same person as both John, the apostle of Jesus and John the Evangelist, author of the Gospel of John. Others contend that they were at least three separate individuals. See Revelation - Authorship and Authorship of the Johannine works.

John the Presbyter, teacher of Papias, bishop of Hieropolis in the early 2nd century, is often conflated with John of Patmos or with the Apostle. The church historian Eusebius of Caesaria was the earliest writer to identify the author of Revelation as John the Presbyter.

For more information on the apostle of Jesus, see John the Apostle.

For more information on the author of the Gospel, see John the Evangelist.