Rui de Sá is a Portuguese voice actor who dubbed Ernie (Egas) for the first three seasons of Rua Sésamo‎, the Portuguese co-production of Sesame Street. He later reprised the role on Brinca Comigo (Play with Me Sesame). De Sá also dubbed Tex Richman in Os Marretas, the Portuguese dub of The Muppets.

De Sá dubbed the narrators on Dragon Ball Z and Pokemon, Stimpy on Ren and Stimpy, Dr. Facilier in The Princess and the Frog, Dr. Claw on Inspector Gadget, Batley on Eureeka's Castle, and Akela and Shere Khan on The Jungle Book anime. For commercials, he dubbed the Yellow M&M.