Noah Schnapp as Charlie Brown (voice)

Bill Melendez as Snoopy / Woodstock (voice) (archive sound)

Marleik 'Mar Mar' Walker as Franklin Armstrong (voice)

Alex Garfin as Linus (voice)

Hadley Belle Miller as Lucy van Pelt (voice)

Rebecca Bloom as Marcie (voice)

Anastasia Bredikhina as Patty (voice)

Venus Schultheis as Peppermint Patty (voice)

A.J. Tecce as Pigpen (voice)

Mariel Sheets as Sally Brown (voice)

Noah Johnston as Schroeder (voice)

William Wunsch as Shermy (voice)

Madisyn Shipman as Violet Grey (voice)

Kristin Chenoweth as Fifi (voice)

Micah Revelli as Little Kid (voice)

Trombone Shorty as Miss Othmar / Mrs. Little Red-Haired Girl (voice)

Francesca Capaldi as The Little Red-Haired Girl / Frieda (voice)

Holly Dorff as Various Voices (voice)

Kelly Michele Mills as Various Voices (voice)

Al Nelson as Various Voices (voice)

Tessa Netting as Various Voices (voice)

Randy Thom as Various Voices (voice)

Randy Trager as Various Voices (voice)

Gwendolyn Yates Whittle as Various Voices (voice)

Gia Bravos as Group Voices (voice)

Ileanna Bravos as Group Voices (voice)

Nikolas Bravos as Group Voices (voice)

Clayton Drier as Group Voices (voice)

Kori Elmore as Group Voices (voice)

Adam Joshua Jastrow as Group Voices (voice)

Frances Bella Kayser as Group Voices (voice)

Theodore F. Kayser as Group Voices (voice)

Ava Kramer as Group Voices (voice)

Sam Lavagnino as Group Voices (voice)

Ava Mae Leslie as Group Voices (voice)

Jaiden A. M. Mathews as Group Voices (voice)

Terence Matthews II as Group Voices (voice)

Dylan Naber as Group Voices (voice)

Marley Pearson as Group Voices (voice)

Aramé Scott as Group Voices (voice)

Eden Vietro as Group Voices (voice)

Nicole Wedel as Group Voices (voice)

Allen Zyler as Group Voices (voice)