Elmer Earl "Butch" Hartman IV (born January 10, 1965) is an American animator, storyboard artist, YouTuber, illustrator, and voice actor, best known for creating Nickelodeon's The Fairly OddParents, T.U.F.F. Puppy, Bunsen Is a Beast, and Danny Phantom. Hartman also owns a production company, Billionfold Inc., which he uses primarily to produce his shows. Hartman was an executive producer on The Fairly OddParents for the entirety of its 16-year run.

On February 8, 2018, Hartman announced in a YouTube video that he had left Nickelodeon on February 2 after having worked at the studio since December 1997; he confirmed that this resulted in the end of production on Bunsen Is a Beast after just one season.

Hartman's latest animated program, HobbyKids Adventures, premiered on YouTube in 2019.