Zachary Gordon

Character: Greg Heffley

Robert Capron

Character: Rowley Jefferson

Devon Bostick

Character: Rodrick Heffley

Peyton List

Character: Holly Hills

Steve Zahn

Character: Frank Heffley

Rachael Harris

Character: Susan Heffley

Grayson Russell

Character: Fregley

Karan Brar

Character: Chirag Gupta

Melissa Roxburgh

Character: Heather Hills

Laine MacNeil

Character: Patty Farrell

Connor Fielding

Character: Manny Heffley

Owen Fielding

Character: Manny Heffley

Philip Maurice Hayes

Character: Stan Warren

Terence Kelly

Character: Grandpa Heffley

Bronwen Smith

Character: Isabella Wendell-Jefferson

Alf Humphreys

Character: Mr. Jefferson

Elise Gatien

Character: Madison

John Shaw

Character: Mr. Draybick

Andrew McNee

Character: Coach Malone

Tom Stevens

Character: Lenwood Heath

Bryce Hodgson

Character: Ben Segal

Christopher De-Schuster

Character: Chris the Bass Player

Dalila Bela

Character: Taylor Pringle

Frank C. Turner

Character: Troop Master Barrett

Emily Holmes

Character: Mrs. Hills

Jeff Kinney

Character: Mr. Jonathon Hills

Amitai Marmorstein

Character: Cranium Shaker Operator

Roan Curtis

Character: Girl at Cranium Shaker #1

Sydney Wong

Character: Girl at Cranium Shaker #2

Reese Alexander

Character: Cop

Cameron Mitchell Jr.

Character: Country Club Manager

Latonya Williams

Character: Receptionist Amy

Nicole Fraissinet

Character: Receptionist Julie

Doug Abrahams

Character: Rodrick's Rescuer

Melody B. Choi

Character: Snack Bar Girl

Wanda Ayala

Character: High Diving Fan

Kyle Cassie

Character: Country Club Waiter

Kevin Kruchkywich

Character: Country Club Pool Guy

Amy Esterle

Character: Country Club Waitress

Gerry Durand

Character: Country Club Valet

Joshua J. Ballard

Character: Spag Union Math Boy

Matt Mazur

Character: Spag Union Tracking Device Boy

Jared Abrahamson

Character: Tim Warren

Matteo Stefan

Character: Biff Warren

Collin MacKechnie

Character: Chip Warren

Sofia Bowers

Character: Li'l Cutie

Dawn Chubai

Character: Newscaster

Anne Openshaw

Character: Mrs. Warren

Keith MacKechnie

Character: Man in Kitchen

Simon Chin

Character: Restaurant Owner

BJ Harrison

Character: Dry Cleaner

Russell Roberts

Character: Confederate Soldier

Paul Fisher

Character: Spag Union Announcer

David Palacio

Character: Spag Union Boy

Peter Brown

Character: Popcorn Vendor (uncredited)

Zeeshan Goawala

Character: Student (uncredited)

Mark Redsky

Character: Cook on Phone (uncredited)

Trenton Rogers

Character: Student (voice) (uncredited)

Cameron K. Smith

Character: Union Rifleman (uncredited)

James O'Sullivan

Character: Sunblock Guy (uncredited)

Ian Thompson

Character: Bus Driver (uncredited)