Zachary Gordon as Greg Heffley

Devon Bostick as Rodrick Heffley

Robert Capron as Rowley Jefferson

Steve Zahn as Frank Heffley

Rachael Harris as Susan Heffley

Fran Kranz as Bill

Peyton List as Holly Hills

Connor Fielding as Manny Heffley

Owen Fielding as Manny Heffley

Andrew McNee as Coach Malone

Karan Brar as Chirag Gupta

Terence Kelly as Grandpa Heffley

Serge Houde as Mr. Salz

Laine MacNeil as Patty Farrell

Grayson Russell as Fregley

Bryce Hodgson as Ben Segal

John Shaw as Mr. Draybick

Alf Humphreys as Mr. Jefferson

Teryl Rothery as Mrs. Kohan

Dalila Bela as Taylor Pringle

Jakob Davies as Scotty Douglas

Maple Batalia as Melissa

Melissa Roxburgh as Rachel

Jeff Kinney as Mr. Jonathon Hills

Alec Willows as Minister

Sean Mathieson as Mean Skater Dude

Belita Moreno as Mrs. Norton

Elysia Rotaru as Ingrid - Girl in The Foot

Benjamin Hollingsworth as Terence - Man in The Foot

Michelle Harrison as Wealthy Woman

Kevin Kazakoff as Wealthy Man

Graeme Duffy as Emcee

Christopher De-Schuster as Chris the Bass Player

Samantha Page as Shelley

Ava Hughes as Marley

Jake D. Smith as Archie Kelly

Owen Best as Bryce Anderson

Spencer Drever as Harry Gilbertson

Michael Strusievici as Crying Boy

Conner Ingram as Young Rodrick

Mark Brandon as Male News Anchor

Dawn Chubai as Female News Anchor

Brenda Anderson as Mrs. Fiorkowski

Doreen Ramus as Mrs. Cabbage

Betty Phillips as Mrs. Evesham

Tae Helgeth as Mrs. Tan

Sheila Paterson as Mrs. Bingham

Monica Marko as Mrs. Anholtz

Darcy Michael as Convenience Store Customer #1

Manoj Sood as Convenience Store Customer #2

Angela Moore as Convenience Store Customer #3

Nancy Ebert as Convenience Store Customer #4

Savannah Lathem as Additional Voice (voice)

Kyle Cornell as Party Goer (uncredited)

Kai Kennedy as Cowering Kid (uncredited)

Tom MacNeill as Teacher (uncredited)