Matt Damon as Benjamin Mee

Scarlett Johansson as Kelly Foster

Thomas Haden Church as Duncan Mee

Colin Ford as Dylan Mee

Maggie Elizabeth Jones as Rosie Mee

Angus Macfadyen as Peter MacCready

Elle Fanning as Lily Miska

Patrick Fugit as Robin Jones

John Michael Higgins as Walter Ferris

Carla Gallo as Rhonda Blair

JB Smoove as Mr. Stevens

Stephanie Szostak as Katherine Mee

Michael Panes as Principal

Kym Whitley as Cashier

Todd Stanton as San Diego Vet

Lauren Sánchez as TV Anchor

Peter Riegert as Delbert McGinty

Roberto Montesinos as Hugo Chavez

Desi Lydic as Shea Seger (Lasagna Mom)

Erick Chavarria as Ernesto

Sam Fox as Alison

Dustin Ybarra as Nathan

Ben Seeder as Bruce

Alice Marie Crowe as Parrot Lady

Michelle Panek as Sarah Tanner (Vet Assistant)

Gary D. Robertson as Male Zookeeper

Nicole Russell as Volunteer

Reid Peters as Volunteer

Taylor Victoria as Zoo Patron

Steven Lee as Zoo Patron

Steve Bessette as Zoo Patron

Kate Yerves as Zoo Patron

Hal Alpert as Zoo Patron

Caroline Hanna as Zoo Patron

Leslie Trotter as Zoo Patron

David James Pryce as Zoo Patron

Benjamin Mee as Visiting Family

Ella Mee as Visiting Family

Milo Mee as Visiting Family

Sammi Yorn as Visiting Family

William Crowe as Zoo Kid

Curtis Crowe as Zoo Kid

Johnny Cicco as Zoo Staff

Alexia Barroso as Zoo Staff

Thomas R. Baker as Pilot

David Dustin Kenyon as Pilot

Shannah Barrett as Party Girl

Christie Kittelsen as Zoo Lover

Machelle Glassburn as Zoo Lover

Bart the Bear II as Buster the Bear

Crystal the Monkey as Crystal the Capuchin

Nicole Andrews as Joyce Jameson (uncredited)

Morgan Bertsch as Popcorn Stand Girl (uncredited)