Greg Heffley

Brady Noon

Rodrick Heffley (voice)

Hunter Dillon

Rowley Jefferson

Ethan William Childress

Susan

Erica Cerra

Frank Heffley (voice)

Chris Diamantopoulos

Manny (voice)

Gracen Newton

Grandpa Heffley

Edward Asner

Barb (voice)

Linda Lavin

Irene (voice)

Loretta Devine

Merle

Priscilla Lopez

Mackie

Nathan Arenas

Drew

Albert Tsai

Larry

Hudson Yang

Bill

Jimmy Tatro

News Anchor

Kimberly Brooks

Leland (voice)

Vincent Tong

Elevator Lady (voice)

Veena Sood

Additional Voices (voice)

Ava Acres

Additional Voices (voice)

Sky Alexis

Additional Voices (voice)

Noah Kaye Bentley

Additional Voices (voice)

Asher Bishop

Additional Voices (voice)

Jen Cain

Additional Voices (voice)

Tristan Allerick Chen

Additional Voices (voice)

Juliet Donenfeld

Additional Voices (voice)

Marley Garner

Additional Voices (voice)

Johnny Gidcomb

Additional Voices (voice)

Lex Lang

Additional Voices (voice)

Michael Leone

Additional Voices (voice)

Susan Leslie

Additional Voices (voice)

Ava Leslie

Additional Voices (voice)

Matt Nolan

Additional Voices (voice)

Andre Robinson

Additional Voices (voice)

Benjamin Valic

Additional Voices (voice)

Paul-Mikél Williams

Additional Voices (voice)

ViviAnn Yee

Additional Voices (voice)

Ruth Zalduondo