In the New Testament how many letters did John write?

Answer 1

John wrote 1 John, 2 John and 3 John.

The Church Fathers - Polycarp, Papias, Irenaeus, Origen, Cyprian, Clement of Alexandra, Tertullian, Eusebius - all attribuuted 1John to the apostle John.

The Church fathers - Irenaeus, Clement of Alexandra, Origen and Cyprian - attributed 2 John to the apostle John

The Church fathers - Irenaeus, Clement of Alexandra, Dionysius, and Cyprian - attributed 3 John to the apostle John

Answer 2

He wrote 3 letters, those of 1 John, 2 John and 3 John.

Answer 3

Although we do not know who the author really was, there are three letters in the New Testament attributed to John.