* [[Naslovna uloga|Naslovni lik]] je Dumbo, a što je nadimak koji nosi Jumbo Jr., [[slon]] s velikim ušima pomoću kojih može letjeti. Kao i Dopey/Glupko u ''[[Snow White and the Seven Dwarfs (1937 film)|Snjeguljici i sedam patuljak]]'', Dumbo nema [[govorna uloga|govornu ulogu]].
* [[Edward Brophy]] kao Timothy Q. Mouse,
an [[ anthropomorphic]] [[ mouse]] who becomes the only friend of Dumbo and his mother Mrs. Jumbo. He teaches Dumbo how to become the " ninth wonder of the universe", and the only flying elephant in the whole world. He is never mentioned by name in the film, but his signature can be read on the contract in a newspaper photograph at the finale.
* [[Verna Felton]] (van špice) kao Mrs. Jumbo, Dumbova majka; također i kao Slonovski matrijarh, ženski vođa cirkuskih slonova.
* [[Herman Bing]] kao Direktor cirkusa,
and though not truly evil is a strict and occasionally arrogant man. He later appears as a villain in the video game ''[[Disney's Villains' Revenge]]''
* [[Margaret Wright (glumica)|Margaret Wright]] kao Casey Junior,
the tender engine hauling the circus train. Casey Junior has a [[2-4-0]] wheel arrangement, a small four-wheeled tender at the back, a big tall funnel, a little lamp hat, a short stumpy boiler, a short stumpy dome with a whistle on the top and a small cowcatcher at his front.
* [[Sterling Holloway]] kao Mr. Stork
* [[Cliff Edwards]] kao Jim Crow