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- Benedict Cumberbatch as The Grinch
- Frank Welker as Max the Dog, Grinch's pet dog and sidekick.
- Jeremy Ray Taylor as Euchariah Who, a 12-years-old resident of Whoville.
- Catherine O'Hara as Tina Who, Euchariah's mother
- Nathan Fillion as Harry Who, Euchariah's father
- Tara Strong as Sassy Who, Euchariah's little sister
- Phyllis Smith as Mariah Who, Euchariah's grandmother
- Eugene Levy as Josiah Who, Euchariah's grandfather
- Max Charles as Greg, Euchariah's best friend
- Laraine Newman as Greg's mother
- Kenan Thompson as Bricklebaum, a jolly citizen of Whoville who is Mabel's owner.
- Angela Lansbury as Mayor McGerkle, the elderly Mayor of Whoville.
- Pharrell Williams as the Narrator
- Dee Bradley Baker as Wuzzy Woozoo
- The Grinch is the fifth Illumination film to become a franchise, after Despicable Me, The Secret Life of Pets, Minions and Sing.
- This is the first Illumination's Halloween film.
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