There have been various conjectures over the years that another disciple of Christ named John may have been responsible for this letter. However, all the evidence points to the author as John the beloved disciple who also wrote the Gospel of John.
May mga ilang sapantaha sa pagdaan ng panahon na maaaring isa pang disipulo na nagngangalan ding Juan ang sumulat ng aklat. Gayunman, itinuturo ng lahat ng ebidensya na ang minamahal na alagad na si Juan ang sumulat ng Aklat ng 2 Juan.