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Casting

Director

Steve Martino, Jimmy Hayward

Producer

Bob Gordon, Bruce Anderson, Patrick Worlock

Executive Producer

Audrey Geisel, Chris Meledandri, Chris Wedge

Screenplay

Ken Daurio, Cinco Paul

Story

Mike Reiss

Original Music Composer

John Powell

Editor

Tim Nordquist

Casting

Christian Kaplan

Production Design

Marcin Jakubowski

Art Direction

Thomas Cardone

Sound Designer

Randy Thom

Jim Carrey
Jim CarreyHorton (voice)
Steve Carell
Steve CarellMayor (voice)
Carol Burnett
Carol BurnettKangaroo (voice)
Will Arnett
Will ArnettVlad (voice)
Seth Rogen
Seth RogenMorton (voice)
Dan Fogler
Dan FoglerCouncilman / Yummo Wickersham (voice)
Isla Fisher
Isla FisherDr. Mary Lou Larue (voice)
Jonah Hill
Jonah HillTommy (voice)
Amy Poehler
Amy PoehlerSally O'Malley (voice)
Jaime Pressly
Jaime PresslyMrs. Quilligan (voice)
Charles Osgood
Charles OsgoodNarrator (voice)
Josh Flitter
Josh FlitterRudy (voice)
Niecy Nash
Niecy NashMiss Yelp (voice)
Jesse McCartney
Jesse McCartneyJoJo (voice)
?
Shelby AdamowskyHedy / Hooly (voice)
Jack Angel
Jack AngelOld Time Who (voice)
?
Caitlin Rose AndersonHelen (voice)
?
Emily AndersonHeather (voice)
Jan Rabson
Jan RabsonTown Cryer (voice)
John Cygan
John CyganWho (voice)
Jess Harnell
Jess HarnellAnother Who (voice)
Debi Derryberry
Debi DerryberryWho Mom (voice)
Samantha Droke
Samantha DrokeHildy / Holly (voice)
Karen Disher
Karen DisherWho Kid (voice)
Marshall Efron
Marshall EfronWickersham Guard 1 (voice)
Bill Farmer
Bill FarmerWillie Bear (voice)
Jason Fricchione
Jason FricchioneJoe (voice)
Heather Goldenhersh
Heather GoldenhershWho Girl (voice)
Selena Gomez
Selena GomezHelga (voice)
Jimmy Hayward
Jimmy HaywardObnoxious Who (voice)
Joey King
Joey KingKatie (voice)
?
Christina MartinoHeidi / Haley (voice)
?
Ellie MartinoHanna (voice)
Laraine Newman
Laraine NewmanGlummox Mom (voice)
Tim Nordquist
Tim NordquistWickersham Guard 2 (voice)
Colleen O'Shaughnessey
Colleen O'ShaughnesseyAngela (voice)
Laura Ortiz
Laura OrtizJessica (voice)
Joe Pasquale
Joe PasqualeThe Dentist (voice)
?
Connor AndersonWho Child #1 (voice)
Isabella Acres
Isabella AcresAdditional Voices (voice)
Bob Bergen
Bob BergenAdditional Voices (voice)
?
Jeff BiancalanaAdditional Voices (voice)
Madison Davenport
Madison DavenportAdditional Voices (voice)
Teresa Ganzel
Teresa GanzelAdditional Voices (voice)
?
Kathy Graves ToonAdditional Voice (voice)
Sherry Lynn
Sherry LynnAdditional Voices (voice)
Danny Mann
Danny MannAdditional Voices (voice)
Mona Marshall
Mona MarshallAdditional Voices (voice)
Mickie McGowan
Mickie McGowanAdditional Voices (voice)
Madison Pettis
Madison PettisAdditional Voices (voice)
Grace Rolek
Grace RolekAdditional Voices (voice)
?
Jennessa RoseAdditional Voices (voice)
Ariel Winter
Ariel WinterAdditional Voices (voice)
Fletcher Sheridan
Fletcher SheridanJojo (singing voice) (uncredited)