Cast & crew
Horton Hears a Who! (2008)
Directed by Steve Martino, Jimmy Hayward Written by Ken Daurio, Cinco Paul
Cast
| Teresa Ganzel | Voices |
| Jimmy Hayward | Obnoxious Leafleter |
| Joey King | Katie Nanna |
| Grace Rolek | Voices |
| Josh Flitter | Rudy |
| Kathy Graves Toon | Stitch (Voice) |
| Madison Pettis | Voices |
| Jennessa Rose | Voices |
| Jesse McCartney | Jojo |
| Niecy Nash | Miss Catherine |
| Jess Harnell | Another Wannabee |
| Mickie McGowan | Voices |
| Jeff Biancalana | Voices |
| Emily Anderson | Heather |
| Debi Derryberry | Max's Mom |
| Jack Angel | Time Trenier |
| Charles Osgood | Stitch (Voice) |
| John Cygan | Stitch (Voice) |
| Caitlin Rose Anderson | Helen |
| Jan Rabson | Cryer |
| Will Arnett | Vlad |
| Jonah Hill | Tommy |
| Seth Rogen | Morton |
| Joe Pasquale | Dentist |
| Connor Anderson | Diretor-1 |
| Marshall Efron | Diretor-1 |
| Selena Gomez | Helga Dahl |
| Isabella Acres | Voices |
| Karen Disher | Kid Shopper |
| Bob Bergen | Voices |
| Ariel Winter | Voices |
| Danny Mann | Voices |
| Jason Fricchione | Joe |
| Carol Burnett | "Zyamka-kangaroo" |
| Fletcher Sheridan | Jojo |
| Isla Fisher | Hedy LaRue |
| Heather Goldenhersh | Topless Girl |
| Shelby Adamowsky | Hooly |
| Mona Marshall | Voices |
| Jim Carrey | Horton |
| Samantha Droke | Hildy |
| Christina Martino | Haley |
| Tim Nordquist | Preso 2 |
| Madison Davenport | Voices |
| Ellie Martino | Hanna |
| Colleen O'Shaughnessey | Angela |
| Bill Farmer | Willie |
| Sherry Lynn | Voices |
| Amy Poehler | O'Malley |
| Steve Carell | Mayor |
| Jaime Pressly | Mrs. Dunn |
| Dan Fogler | Councilman |
| Laura Ortiz | Jessica |
| Laraine Newman | Max's Mom |
| Steve Carell | Mayor (voice) |
| Carol Burnett | Kangaroo (voice) |
| Will Arnett | Vlad (voice) |
| Seth Rogen | Morton (voice) |
| Dan Fogler | Councilman / Yummo Wickersham (voice) |
| Isla Fisher | Dr. Mary Lou Larue (voice) |
| Jim Carrey | Horton (voice) |
| Charles Osgood | Narrator (voice) |
| Shelby Adamowsky | Hedy / Hooly (voice) |
| Jonah Hill | Tommy (voice) |
| Amy Poehler | Sally O'Malley (voice) |
| Jaime Pressly | Mrs. Quilligan (voice) |
| Niecy Nash | Miss Yelp (voice) |
| Jesse McCartney | JoJo (voice) |
| Jack Angel | Old Time Who (voice) |
| Josh Flitter | Rudy (voice) |
| Caitlin Rose Anderson | Helen (voice) |
| Emily Anderson | Heather (voice) |
| Jan Rabson | Town Cryer (voice) |
| John Cygan | Who (voice) |
| Samantha Droke | Hildy / Holly (voice) |
| Jess Harnell | Another Who (voice) |
| Debi Derryberry | Who Mom (voice) |
| Karen Disher | Who Kid (voice) |
| Marshall Efron | Wickersham Guard 1 (voice) |
| Jason Fricchione | Joe (voice) |
| Joey King | Katie (voice) |
| Christina Martino | Heidi / Haley (voice) |
| Ellie Martino | Hanna (voice) |
| Bill Farmer | Willie Bear (voice) |
| Heather Goldenhersh | Who Girl (voice) |
| Selena Gomez | Helga (voice) |
| Jimmy Hayward | Obnoxious Who (voice) |
| Laraine Newman | Glummox Mom (voice) |
| Colleen O'Shaughnessey | Angela (voice) |
| Joe Pasquale | The Dentist (voice) |
| Connor Anderson | Who Child #1 (voice) |
| Isabella Acres | Additional Voices (voice) |
| Tim Nordquist | Wickersham Guard 2 (voice) |
| Laura Ortiz | Jessica (voice) |
| Bob Bergen | Additional Voices (voice) |
| Jeff Biancalana | Additional Voices (voice) |
| Madison Davenport | Additional Voices (voice) |
| Teresa Ganzel | Additional Voices (voice) |
| Kathy Graves Toon | Additional Voice (voice) |
| Sherry Lynn | Additional Voices (voice) |
| Mona Marshall | Additional Voices (voice) |
| Grace Rolek | Additional Voices (voice) |
| Jennessa Rose | Additional Voices (voice) |
| Danny Mann | Additional Voices (voice) |
| Mickie McGowan | Additional Voices (voice) |
| Madison Pettis | Additional Voices (voice) |
| Fletcher Sheridan | Jojo (singing voice) (uncredited) |
| Ariel Winter | Additional Voices (voice) |
Crew
| Steve Martino | Director |
| Mac Smith | Sound Effects Editor |
| Ken Daurio | Screenplay |
| Kyle Macnaughton | Set Designer |
| Bob Gordon | Producer |
| Ricardo Curtis | Head of Story |
| Marcin Jakubowski | Production Design |
| Martin Fuller | Storyboard Artist |
| Christian Kaplan | Casting |
| Rich Moore | Additional Storyboarding |
| Jeff Biancalana | Storyboard Artist |
| Eric Favela | Storyboard Artist |
| Alen Lai | Senior Visual Effects Supervisor |
| Randy Thom | Supervising Sound Editor |
| Jony Chandra | Storyboard Artist |
| Michael Thurmeier | Visual Effects |
| Arun Ram-Mohan | Lighting Artist |
| Michael Knapp | Set Designer |
| Jamie Kirschenbaum | Senior Visual Effects Supervisor |
| Cal Brunker | Storyboard Artist |
| Paul Downs | Animation |
| Jon Vitti | Story Consultant |
| Jake Parker | Set Designer |
| Jimmy Hayward | Director |
| Wilbert Plijnaar | Additional Storyboarding |
| Chris Renaud | Storyboard Artist |
| J.G. Quintel | Additional Storyboarding |
| Tony Maki | Storyboard Artist |
| Rafael Zentil | Storyboard Artist |
| Guillermo Willie Real | Set Designer |
| Jeff Siergey | Additional Storyboarding |
| Stephanie Arnett | Additional Storyboarding |
| Chris Gilligan | Additional Storyboarding |
| Tansal Arnas | Schedule Coordinator |
| Karen Disher | Storyboard Artist |
| Frank Marino | Additional Storyboarding |
| William H. Frake III | Storyboard Artist |
| Edmund Fong | Additional Storyboarding |
| Scott Farrell | Lighting Artist |
| Galen T. Chu | Visual Effects |
| David Esneault | Lighting Director |
| Dr. Seuss | Book |
| Chris Wedge | Executive Producer |
| Thomas Cardone | Art Direction |
| Barry E. Jackson | Visual Development |
| Randy Thom | Sound Designer |
| Dennis Leonard | Supervising Sound Editor |
| Wesley Mandell | Lighting Artist |
| Tom Carlson | Supervising Music Editor |
| Tim Nordquist | Editor |
| Simon Brown | Senior Visual Effects Supervisor |
| Rhett Collier | Senior Visual Effects Supervisor |
| Crystal Chesney | Additional Storyboarding |
| Cinco Paul | Screenplay |
| Patrick Worlock | Producer |
| Audrey Geisel | Executive Producer |
| John Powell | Original Music Composer |
| Moroni Taylor | Storyboard Artist |
| Chris Meledandri | Executive Producer |
| Nash Dunnigan | Set Designer |
| Lizette Vega | Set Designer |
| Jeannine Berger | Post Production Supervisor |
| Bruce Anderson | Producer |
| John Powell | Original Music Composer |
| Jimmy Hayward | Director |
| Steve Martino | Director |
| Bob Gordon | Producer |
| Tim Nordquist | Editor |
| Audrey Geisel | Executive Producer |
| Chris Wedge | Executive Producer |
| Chris Meledandri | Executive Producer |
| Arun Ram-Mohan | Lighting Artist |
| Paul Downs | Animation |
| Ricardo Curtis | Head of Story |
| Ken Daurio | Screenplay |
| Cinco Paul | Screenplay |
| Bruce Anderson | Producer |
| Jeannine Berger | Post Production Supervisor |
| Stephanie Arnett | Additional Storyboarding |
| Crystal Chesney | Additional Storyboarding |
| Edmund Fong | Additional Storyboarding |
| Chris Gilligan | Additional Storyboarding |
| Jeff Siergey | Additional Storyboarding |
| Barry E. Jackson | Visual Development |
| David Esneault | Lighting Director |
| Christian Kaplan | Casting |
| Frank Marino | Additional Storyboarding |
| Rich Moore | Additional Storyboarding |
| Wilbert Plijnaar | Additional Storyboarding |
| J.G. Quintel | Additional Storyboarding |
| Tansal Arnas | Schedule Coordinator |
| Thomas Cardone | Art Direction |
| Randy Thom | Sound Designer |
| Nash Dunnigan | Set Designer |
| Dr. Seuss | Book |
| Rhett Collier | Senior Visual Effects Supervisor |
| Jamie Kirschenbaum | Senior Visual Effects Supervisor |
| Alen Lai | Senior Visual Effects Supervisor |
| Randy Thom | Supervising Sound Editor |
| Michael Knapp | Set Designer |
| Kyle Macnaughton | Set Designer |
| Jake Parker | Set Designer |
| Guillermo Willie Real | Set Designer |
| Lizette Vega | Set Designer |
| Simon Brown | Senior Visual Effects Supervisor |
| Tom Carlson | Supervising Music Editor |
| Dennis Leonard | Supervising Sound Editor |
| Mac Smith | Sound Effects Editor |
| Marcin Jakubowski | Production Design |
| Wesley Mandell | Lighting Artist |
| Scott Farrell | Lighting Artist |
| Michael Thurmeier | Visual Effects |
| Patrick Worlock | Producer |
| Galen T. Chu | Visual Effects |
| Jon Vitti | Story Consultant |
| Cal Brunker | Story Artist |
| Jony Chandra | Story Artist |
| Eric Favela | Story Artist |
| Martin Fuller | Story Artist |
| Chris Renaud | Story Artist |
| Jeff Biancalana | Story Artist |
| Karen Disher | Story Artist |
| Moroni Taylor | Story Artist |
| Tony Maki | Story Artist |
| Rafael Zentil | Story Artist |
| William H. Frake III | Story Artist |