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.

The Johannine epistles, the Epistles of John, or the Letters of John are the First Epistle of John, the Second Epistle of John, and the Third Epistle of John, three of the catholic epistles in the New Testament. In content and style they resemble the Gospel of John. Specifically in the First Epistle of John, Jesus is identified with the divine Christ, and more than in any other New Testament text, God's love of humanity is emphasised.