Zachary Gordon
Greg Heffley
Acting
Robert Capron
Rowley Jefferson
Acting
Steve Zahn
Frank J. Heffley
Acting
Devon Bostick
Rodrick Heffley
Acting
Rachael Harris
Susan Heffley
Acting
Chloë Grace Moretz
Angie Steadman
Acting
Laine MacNeil
Patty Farrell
Acting
Andrew McNee
Coach Malone
Acting
Connor Fielding
Manny Heffley
Acting
Owen Fielding
Manny Heffley
Acting
Karan Brar
Chirag Gupta
Acting
Grayson Russell
Fregley
Acting
Alex Ferris
Collin
Acting
Belita Moreno
Mrs. Norton
Acting
Rob LaBelle
Mr. Winsky
Acting
Nicholas Carey
Pete Hosey
Acting
Samuel Patrick Chu
Carter
Acting
Donnie MacNeil
Wade
Acting
Samantha Page
Shelley
Acting
Ava Hughes
Marley
Acting
Owen Best
Bryce Anderson
Acting
Cainan Wiebe
Quentin
Acting
Cole Heppell
Quentin's Sidekick
Acting
Harrison Houde
Darren Walsh
Acting
Severin Korfer
Dieter Muller
Acting
Jennifer Clement
Mrs. Flint
Acting
Karin Konoval
Mrs. Irvine
Acting
Raugi Yu
Vice Principal Roy
Acting
Kaye Capron
Rowley's Mom
Acting
Jake D. Smith
Archie Kelly
Acting
Talon Dunbar
Arthur
Acting
Naomi Dane
Cheese Girl
Acting
Willem Jacobson
Cheese Boy
Acting
Sean Bygrave
Coach Brewer
Acting
Maxine Miller
Elderly Woman
Acting
Taya Clyne
Granddaughter
Acting
Nathaniel Marten
Grown-Up Greg
Acting
Peter New
Grown-Up Quentin
Acting
Nikki Frazer
Lunch Girl #1
Acting
Greta Makena Gibson
Lunch Kid #2
Directing
Nathan Smith
Kindergarten Boy
Acting
Kinua McWatt
Kindergarten Girl
Acting
Dylan Bell
Kindergarten Greg
Acting
Madison Bell
Kindergarten Patty
Acting
Adom Osei
Marty Porter
Acting
Alf Humphreys
Mr. Jefferson
Acting
Brent Chapman
Mr. Parnell
Acting
Rylee Stiles
Preston
Acting
Ryan Grantham
Rodney James
Acting
Ethan Shankaruk
Snot Kid
Acting
Jesse Wheeler
Unpopular 80s Boy
Acting
Paul Hubbard
Brock Branigan
Acting
Brett Dier
80s Breakdancer
Acting
Brandon Barton
80s Jock Boy
Acting
Cindy Busby
80s Popular Girl
Acting
Alicia Takase Lui
Audition Kid
Acting
Jay Sidhu
Audition Kid
Acting
Tori Christianson
Audition Kid
Acting
Emerald Schreier
Audition Kid
Acting
Ben Mitchell
Audition Kid
Acting
Haris Cash
Audition Kid
Acting
Mariah Crudo
Audition Kid
Acting
Alistair Abell
Male Reporter (voice)
Acting
Tara McGuire
Female Reporter (voice)
Acting
Aidan Gebert
Löded Diper
Acting
Cameron Krpan
Löded Diper
Acting
Paolo Tolfo
Löded Diper
Acting
Amy Esterle
Waitress (uncredited)
Acting