What follows is an an organized and curated list of content. Click here for an exhaustive list of content on Haggai
Homer Heater Jr.: 16. Haggai  Part of a series on the Old Testament prophets. History, Background, Extensive paragraph outline.
Kenneth Boa: 45. Haggai  Part of the series: Visual Survey of the Bible.
Bill McRae: 30. Zephaniah and Haggai  Part of the series: Survey of the Bible.
Mark Dever: Are Your Investments Sound? – The Message of Haggai  Capitol Hill Baptist Church.
Ray Stedman: Haggai: Some Words to Discouraged Carpenters [, , Translated] Part of the series: Adventuring Through the Bible. Peninsula Bible Church. Spanish translation available.
David Dean: The Book of Haggai  6 lessons: Setting, Tracking the Temple through Time, From Dedication to Desolation, Haggai 1; 2:1-9; 2:10-23.
Thabiti Anyabwile: How to Finish Well  2 lessons. Capitol Hill Baptist Church.
S. Lewis Johnson: Haggai [, ] 4 lessons.
John Piper: Take Courage: You Build More Than You See [, ] 1 lesson.
Eugene H. Merrill: 1. Haggai
Study Helps and related
Tom Constable: Tom Constable’s Expository Notes on Haggai  This is also available in the Net.Bible.org Study Environment.
David Malick: An Introduction to the Book of Haggai 
J. Hampton Keathley, III: 7. The Minor Prophets  Part of the series: Concise Old Testament Survey.
Hampton Keathley IV: 10. Haggai Part of the series: The Minor Prophets.