Harold E. Schmul (January 26, 1921 – June 26, 1998) was an American preacher, evangelist, and publisher whose ministry within the holiness movement spanned over five decades, emphasizing revival and conservative Christian values. Born in Cincinnati, Ohio, to parents of German descent—his family name tracing back to immigrants fleeing religious persecution—he grew up in a modest home, shaped by a strong evangelical faith. Converted at a young age, he pursued ministry training through practical experience rather than formal theological education, aligning with his call to preach at age 17, later refined during his service in the U.S. Army Air Corps in World War II. Schmul’s preaching career began in earnest after marrying Lois Pauline Hall in 1941, leading to roles as a pastor, missionary, and evangelist across holiness churches in Ohio and beyond. In 1952, with H. Robb French, he co-founded the InterChurch Holiness Convention (IHC) in Cincinnati to unite conservative holiness groups for revival, a movement that grew to host thousands annually. Known for his fiery sermons—preserved on SermonIndex.net—he preached heart purity and spiritual victory, also founding Schmul Publishing Co. to distribute holiness literature. Married to Lois, with whom he had two sons, Harold II and Bradly, he passed away at age 77 in Salem, Ohio.