Michael Beattie / Store Clerk (voice)
Lori Alan / Additional Voices (voice)
Carlos Alazraqui / Additional Voices (voice)
Doug Burch / Additional Voices (voice)
Cathy Cavadini / Additional Voices (voice)
Tucker Chandler / Additional Voices (voice)
Townsend Coleman / Additional Voices (voice)
Meilee Condron / Additional Voices (voice)
Abby Craden / Additional Voices (voice)
Brian T. Delaney / Additional Voices (voice)
John DeMita / Additional Voices (voice)
Bill Farmer / Additional Voices (voice)
Aaron Fors / Additional Voices (voice)
Willow Geer / Additional Voices (voice)
Jess Harnell / Additional Voices (voice)
Barbara Harris / Additional Voices (voice)
Carter Hastings / Additional Voices (voice)
John Kassir / Additional Voices (voice)
Evan Kishiyama / Additional Voices (voice)
Danny Mann / Additional Voices (voice)
Jeremy Maxwell / Additional Voices (voice)
Scott Mosier / Additional Voices (voice)
Laraine Newman / Additional Voices (voice)
Dashiell Priestley / Additional Voices (voice)
Alex Puccinelli / Additional Voices (voice)
Emma Elizabeth Shannon / Additional Voices (voice)
Joel Swetow / Additional Voices (voice)
Mindy Sterling / Additional Voices (voice)
Tara Strong / Additional Voices (voice)
Jim Ward / Additional Voices (voice)
Regina Taufen / Additional Voices (voice)
Pierre Coffin / Bob the Minion
Kresimir Mikic / Grinch
Pentatonix / Who-Carolers
Georgia Toffolo / Mrs. Toffee Apple (voice)

Erica Luttrell / Erica /  George's Mom (voice)
Patty Mattson / Miss Anthrope /  Harold's Mom (voice)
Brennan Murray / Bo Hweemuth (voice)
Nolan North / Yule Tide /  Lee Dingman /  Movie Harold (voice)
Nolan North / Movie Santa (voice)
Kevin Michael Richardson / George's Dad /  Movie George (voice)