Marta Madeira is a Portuguese voice actress known for her work in dubbing animated series and films into Portuguese. She became a recognizable figure to younger audiences in 2000 through her role on the program Rita Catita e o Ursinho Oops, where she played the live-action character Rita Catita.

Her voice acting work in anime includes several notable roles. In the series Ojamajo Doremi, known in Portuguese as Doremi, she voiced Hazuki Fujiwara and Popu Harukaze. Her other anime roles include Maylu and IceMan.EXE in Megaman, Yukino and Sanae in Samurai 7, Mai Valentine in the fourth and fifth seasons of Yu-Gi-Oh!, Yuko in Pokémon 7: Alma Gémea, and Sumire Kanzaki and Kanna Kirishima in Sakura Wars: The Movie.

Beyond anime, her extensive dubbing career includes work on many Western animated properties. She voiced multiple characters in various My Little Pony films and series, including Rainbow Dash and Zipzee. She also provided voices for Polly Pocket in Polly World and Polly Pocket: Muito Fixe no Pocket Plaza, Layla in Winx Club, and Vicky in the 2013 series Vicky, o Viking. Her work spans multiple dubbing studios, including PSB, Miragem, and Digital Azul.