Vital statistics for Dr. Seuss' Horton Hears Who Main Cast Jim Carrey, Steve Carell Supporting Cast Carol Burnett, Will Arnett, Seth Rogen, Isla Fisher, Jonah Hill Director Jimmy Hayward, Steve Martino Screenwriter Ken Daurio, Cinco Paul Distributor Twentieth Century Fox Rating G Running Time 88 minutes Talent in red has entry in The Big Picture