Rex Nunes, also known as Régis Nunes or Reginaldo Nunes, is a Brazilian voice actor recognized for his work in dubbing anime into Portuguese. He is particularly noted for his performances in the 2018 remake of the sports anime Captain Tsubasa, where he voices two distinct characters: Masao Tachibana, one half of the twin defenders known for their coordinated plays, and Munemasa Katagiri, an official from the Japan Football Association who serves as a talent scout and supporter of the young players.

Beyond his prominent roles in Captain Tsubasa, Nunes has built an extensive career in anime dubbing. His filmography includes a wide range of characters across numerous popular series. He is the voice of Chikara Ennoshita in the volleyball anime Haikyu!! and its second season. He has also contributed to major long-running franchises, providing voices in the new dub of One Piece for characters such as Akumai, Gyaro, and Brannew in the film One Piece Stampede. His other notable anime credits include roles in My Hero Academia as Itejiro Toteki, Demon Slayer: Kimetsu no Yaiba as Kazumi, Tokyo Ghoul √A and Tokyo Ghoul:re as Naki, and Hunter × Hunter (2011).

Nunes's work extends to various other anime, demonstrating his versatility. He has voiced characters in series such as Inazuma Eleven: Ares no Tenbin, Classroom of the Elite, Ranking of Kings, and JoJo's Bizarre Adventure. His dubbing credits also encompass films, including Evangelion: 2.0 You Can (Not) Advance, Yu-Gi-Oh!: The Dark Side of Dimensions, and Yo-kai Watch: Enma Daioh to Itsutsu no Monogatari da Nyan!. In addition to animation, he has lent his voice to live-action productions, such as dubbing the role of Nariaki Utsumi in the Japanese tokusatsu series Kamen Rider Build.