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Directed by

Jim Carrey Jim Carrey
Horton (voice)
Steve Carell Steve Carell
Mayor (voice)
Carol Burnett Carol Burnett
Kangaroo (voice)
Will Arnett Will Arnett
Vlad (voice)
Seth Rogen Seth Rogen
Morton (voice)
Dan Fogler Dan Fogler
Councilman / Yummo Wickersham (voice)
Isla Fisher Isla Fisher
Dr. Mary Lou Larue (voice)
Jonah Hill Jonah Hill
Tommy (voice)
Amy Poehler Amy Poehler
Sally O'Malley (voice)
Jaime Pressly Jaime Pressly
Mrs. Quilligan (voice)
Charles Osgood Charles Osgood
Narrator (voice)
Josh Flitter Josh Flitter
Rudy (voice)
Niecy Nash Niecy Nash
Miss Yelp (voice)
Jesse McCartney Jesse McCartney
JoJo (voice)
Shelby Adamowsky Shelby Adamowsky
Hedy / Hooly / Additional Voices (voice)
Jack Angel Jack Angel
Old Time Who / Additional Voices (voice)
Caitlin Rose Anderson Caitlin Rose Anderson
Helen (voice)
Emily Anderson Emily Anderson
Heather (voice)
Jan Rabson Jan Rabson
Town Cryer / Additional Voices (voice)
John Cygan John Cygan
Who / Additional Voices (voice)
Jess Harnell Jess Harnell
Another Who / Additional Voices (voice)
Debi Derryberry Debi Derryberry
Who Mom / Additional Voices (voice)
Samantha Droke Samantha Droke
Hildy / Holly (voice) (as Samantha Raye Droke)
Karen Disher Karen Disher
Who Kid (voice)
Marshall Efron Marshall Efron
Wickersham Guard 1 (voice)
Bill Farmer Bill Farmer
Willie Bear / Additional Voices (voice)
Jason Fricchione Jason Fricchione
Joe (voice)
Heather Goldenhersh Heather Goldenhersh
Who Girl / Additional Voices (voice)
Selena Gomez Selena Gomez
Helga (voice)
Jimmy Hayward Jimmy Hayward
Obnoxious Who (voice)
Joey King Joey King
Katie (voice)
Christina Martino Christina Martino
Heidi / Haley (voice)
Ellie Martino Ellie Martino
Hanna / Additional Voices (voice)
Laraine Newman Laraine Newman
Glummox Mom / Additional Voices (voice)
Tim Nordquist Tim Nordquist
Wickersham Guard 2 (voice)
Colleen O Colleen O'Shaughnessey
Angela / Additional Voices (voice)
Laura Ortiz Laura Ortiz
Jessica (voice)
Joe Pasquale Joe Pasquale
The Dentist (voice)
Connor Anderson Connor Anderson
Who Child #1 (voice)
Isabella Acres Isabella Acres
Additional Voices (voice)
Bob Bergen Bob Bergen
Additional Voices (voice)
Jeff Biancalana Jeff Biancalana
Additional Voices (voice)
Madison Davenport Madison Davenport
Additional Voices (voice)
Teresa Ganzel Teresa Ganzel
Additional Voices (voice)
Kathy Graves Toon Kathy Graves Toon
Additional Voice (voice) (as Kathy Graves)
Sherry Lynn Sherry Lynn
Additional Voice (voice)
Danny Mann Danny Mann
Additional Voices (voice)
Mona Marshall Mona Marshall
Additional Voices (voice)
Mickie McGowan Mickie McGowan
Additional Voices (voice)
Madison Pettis Madison Pettis
Additional Voices (voice)
Grace Rolek Grace Rolek
Additional Voices (voice)
Jennessa Rose Jennessa Rose
Additional Voices (voice)
Ariel Winter Ariel Winter
Additional Voices (voice)

Written by
Ken Daurio Ken Daurio
Cinco Paul Cinco Paul
Dr. Seuss Dr. Seuss
based upon the book by
Jeff Siergey Jeff Siergey
additional story