Billy Crystal

Mike Wazowski (voice)

John Goodman

James 'Sulley' Sullivan (voice)

Helen Mirren

Dean Hardscrabble (voice)

Steve Buscemi

Randall Boggs (voice)

Peter Sohn

Scott 'Squishy' Squibbles (voice)

Joel Murray

Don Carlton (voice)

Aubrey Plaza

Claire Wheeler (voice)

Sean Hayes

Terri Perry (voice)

Dave Foley

Terry Perry (voice)

Charlie Day

Art (voice)

Alfred Molina

Professor Knight (voice)

Tyler Labine

Brock Pearson (voice)

Nathan Fillion

Johnny Worthington (voice)

Bobby Moynihan

Chet Alexander (voice)

Noah Johnston

Young Mike (voice)

Julia Sweeney

Ms. Squibbles (voice)

Bonnie Hunt

Karen Graves (voice)

John Krasinski

Frank McCay (voice)

Bill Hader

Referee / Slug (voice)

Beth Behrs

Carrie Williams (voice)

Bob Peterson

Roz (voice)

John Ratzenberger

Yeti (voice)

Lori Alan

Additional Voices (voice)

Carlos Alazraqui

Additional Voices (voice)

Jack Angel

Additional Voices (voice)

Bob Bergen

Additional Voices (voice)

Gregg Berger

Additional Voices (voice)

Rodger Bumpass

Additional Voices (voice)

Neil Campbell

Additional Voices (voice)

Frank Oz

Fungus (voice)

Ava Acres

Additional Children's Voices (voice)

Sherry Lynn

Additional Voices (voice)

Paul Lazenby

Monster (voice, uncredited)

Aramé Scott

Additional Children's Voices (voice)

Joseph John Schirle

Additional Children's Voices (voice)

Kristen Li

Additional Children's Voices (voice)

Davin Ransom

Additional Children's Voices (voice)

Raymond Ochoa

Additional Children's Voices (voice)

Calum John

Additional Children's Voices (voice)

Montse Hernandez

Additional Children's Voices (voice)

Mason Cook

Additional Children's Voices (voice)

Makenna Cowgill

Additional Children's Voices (voice)

Tyree Brown

Additional Children's Voices (voice)

Jack Bright

Additional Children's Voices (voice)

Isabella Acres

Additional Children's Voices (voice)

April Winchell

Additional Voices (voice)

Colette Whitaker

Additional Voices (voice)

Jim Ward

Additional Voices (voice)

Marcia Wallace

Additional Voices (voice)

David Theune

Additional Voices (voice)

Tara Strong

Additional Voices (voice)

Mindy Sterling

Additional Voices (voice)

Joel Spence

Additional Voices (voice)

Betsy Sodaro

Additional Voices (voice)

Dan Scanlon

Additional Voices (voice)

Patrick Seitz

Additional Voices (voice)

Jan Rabson

Additional Voices (voice)

Cristina Pucelli

Additional Voices (voice)

Jeff Pidgeon

Additional Voices (voice)

Dannah Feinglass Phirman

Additional Voices (voice)

Donovan Patton

Additional Voices (voice)

Bret Parker

Additional Voices (voice)

Colleen O'Shaughnessey

Additional Voices (voice)

Laraine Newman

Additional Voices (voice)

David Neher

Additional Voices (voice)

Pam Murphy

Additional Voices (voice)

Matthew Mercer

Additional Voices (voice)

Alec Medlock

Additional Voices (voice)

Allan McLeod

Additional Voices (voice)

Mickie McGowan

Additional Voices (voice)

Mona Marshall

Emmet (voice)

Tricia McAlpin

Additional Voices (voice)

Jason Marsden

Additional Voices (voice)

Danny Mann

Additional Voices (voice)

Dawnn Lewis

Additional Voices (voice)

Elissa Knight

Additional Voices (voice)

Jess Harnell

Additional Voices (voice)

John Kassir

Additional Voices (voice)

Brandon Johnson

Additional Voices (voice)

Mike Hanford

Additional Voices (voice)

Daniel Gerson

Additional Voices (voice)

Teresa Ganzel

Additional Voices (voice)

Donald Fullilove

Additional Voices (voice)

Andy Fischer-Price

Additional Voices (voice)

Keith Ferguson

Additional Voices (voice)

Bill Farmer

Additional Voices (voice)

John Cygan

Additional Voices(voice)

Paul Eiding

Additional Voices (voice)

Greg Dykstra

Additional Voices (voice)

Sean Conroy

Additional Voices (voice)

Patrick Carlyle

Additional Voices (voice)

Natalie Jane Dang

Additional Children's Voices (voice)

Gage Davenport

Additional Children's Voices (voice)

Ethan Louis Samuels DiSalvio

Additional Children's Voices (voice)

Faith Goblirsch

Additional Children's Voices (voice)

Brooke Klinger

Additional Children's Voices (voice)

Nikolas Michailidis

Additional Children's Voices (voice)

Jamel Debbouze

Additional Voices (voice)

Marley Pearson

Additional Children's Voices (voice)

Malik Bentalha

Additional Voices (voice)

Davin Doak

Additional Children's Voices (voice)

Lindsay Lefler

Additional Voices (voice)

Aria Noelle Curzon

(uncredited)