What follows is an an organized and curated list of content. Click here for an exhaustive list of content on 2 John
Kenneth Boa: 75. 2 John  Part of the series: Visual Survey of the Bible.
Bill McRae: 48. 1 John, 2 John and 3 John  Part of the series: Survey of the Bible.
Mark Dever: Truth and Love: The Message of 2 John  Capitol Hill Baptist Church.
Ray Stedman: Second John: The Vital Balance [, , Translated] Part of the series: Adventuring Through the Bible. Spanish translation available. Peninsula Bible Church.
John MacArthur: 2 John 4 lessons.
Steven J. Cole: 2 and 3 John [, ] 3 lessons.
S. Lewis Johnson: 1st. 2nd, & 3rd John [, ] 1 lesson on 2 John. Believers Chapel.
Andy Johnson: Truth, Lies, and Love – 2 John  Capitol Hill Baptist Church.
John Piper: Life Together at the End of the Age [, , ] 1 lesson.
W. Hall Harris III: 16. Exegetical Commentary on 2 John 1-13 [, Technical] Part of the series: 1, 2, 3 John Comfort and Counsel for a Church in Crisis.
An Out-of-this-World Experience: A Look at "κόσμος" in the Johannine Literature [, Technical]
Study Helps and related
Tom Constable: Tom Constable’s Expository Notes on 2 John  This is also available in the Net.Bible.org Study Environment.
J. Hampton Keathley, III: 5. The Non-Pauline Epistles 
David Malick: An Introduction To The Book Of 2 John 
An Argument For The Book Of 2 John 
W. Hall Harris III: 19. Bibliography of Major Commentaries on 1, 2, 3 John 
Daniel B. Wallace: 24. 2 John: Introduction, Argument, and Outline