Dário de Castro is a Brazilian voice actor who narrated the Brazilian version of Thomas and Friends. He provided narration for the last two episodes of the first season as well as the eighth - twelfth seasons, as well as for Calling All Engines! and The Great Discovery.

He is best known for voicing Martian Manhunter from "The Batman" and "Justice League", John Smith from Disney's "Pocahontas" films, Rocky from "Chicken Run", Phoebus from Disney's "The Hunchback of Notre Dame", Clayton from "Tarzan", I. M. Weasel from "I Am Weasel", and Allomere from "Legends of the Guardians: The Owls of Ga'Hoole".