Zachary Gordon character Greg Heffley
Steve Zahn character Frank Heffley
Devon Bostick character Rodrick Heffley
Robert Capron character Rowley Jefferson
Rachael Harris character Susan Heffley
Peyton List character Holly Hills
Grayson Russell character Fregley
Karan Brar character Chirag Gupta
Laine MacNeil character Patty Farrell
Connor Fielding character Manny Heffley
Owen Fielding character Manny Heffley
Melissa Roxburgh character Heather Hills
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
B. J. 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)
