A lot of actors in The Amazing World of Gumball tend to lend their voice to more than one character.
- Both Principal Brown and Ms. Simian were voiced by Lewis MacLeod in the first season.
- Richard, Mr. Fitzgerald, the Doughnut Sheriff (after season one), and the Ripley 2000 manager, are all voiced by Dan Russell.
- All the police officers are voiced by Dan Russell, except for the female Coffee Cop (who is the only female police officer), the Doughnut Sheriff in Season 1 (when there weren't any other cops), and the soda can cop.
- Jessica McDonald voices Carrie, Masami, Sarah, Rachel, Molly, Jamie in Season 1 and 2, Betty in Season 1 and Daisy The Donkey.
- Her sister Naomi McDonald voices Clare, Rotten Cupcake, Brydie and Banana Barbara from season 6 onward.
- Aside from voicing Gumball, Jacob Hopkins also voiced Zach and Chi Chi.
- Kyla Kowalewski voices both Anais and Rosie.
- Teresa Gallagher voices Nicole, Penny, Mrs. Robinson, Jackie, Teri, Polly and Chi Chi's mother.
- Sandra Searles Dickinson voices Granny Jojo, Mrs. Jotunheim, Alison Sandra Gator, Martha Miller, Felicity Parham, Karen and Maria.
- Mic Graves voices Banana Joe, William, Sussie's father, Banana Bob, Daniel Lennard, Leonard Daniels and the Clown.
- Kerry Shale voices Larry, Bobert, Leslie, Hector, Sal Left Thumb, the sun, the virus, Colin and Vladus.
- Max Cazier voices Clayton season 2 onwards, Ocho and the checkout clerk.
- Simon Lipkin voices the Green Bear, Mr. Corneille, Mowdown and Ken.
