John of Patmos is the name traditionally given to the author of the Book of Revelation. Revelation 1:9 states that John was on Patmos, an Aegean island off the coast of Roman Asia, where according to most biblical historians, he was exiled as a result of anti-Christian persecution under the Roman emperor Domitian.

John the Evangelist is the name traditionally given to the author of the Gospel of John. Christians have traditionally identified him with John the Apostle, John of Patmos, and John the Presbyter, although this has been disputed by most modern scholars.