Elmer Earl "Butch" Hartman IV (born January 10, 1965) is an American animator, voice actor, writer, storyboard artist, and director; best known for creating the Nicktoons The Fairly OddParents, Danny Phantom, T.U.F.F. Puppy and Bunsen is a Beast. 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.

Hartman's latest animated program, Bunsen is a Beast, aired in 2017. 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 in the video that this resulted in the end of production on Bunsen Is a Beast after just one season.

Hartman also worked on Dexter's Laboratory.

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