Yan Gesteira is a Brazilian voice actor known for his work in the dubbing of numerous animated series, anime, and live-action films and television shows. He began his career in voice acting as a child and is the grandson of fellow voice actor Carlos Gesteira.

Gesteira has lent his voice to a wide variety of prominent anime characters in their Brazilian Portuguese dubs. His roles include Itsuki Kawasumi in The Rising of the Shield Hero, Clemont in Pokémon the Movie: Volcanion and the Mechanical Marvel, and Kōki Toguchi in RE-MAIN. He also voices Makoto Takiya in Miss Kobayashi's Dragon Maid S, Atsushi "Akkun" Sendō in Tokyo Revengers, and Chimaki Yamori in 7SEEDS. Other notable anime credits include Cosmo Imai in Kengan Ashura, Asta in Black Clover, and Poochie in Demashitaa! Powerpuff Girls Z. In film, he voiced the protagonist Hodaka Morishima in the Brazilian dub of the hit movie Weathering With You.

Beyond anime, Gesteira's voice is widely recognized for dubbing characters in major Western animation and live-action productions. He is known as the voice of Phineas Flynn in the first season of Phineas & Ferb, Nathaniel Kurtzberg in Miraculous: Tales of Ladybug & Cat Noir, and Cooper Daniels and Billy Billions in various Ben 10 series. His extensive live-action dubbing work includes being the regular Brazilian Portuguese voice for actors such as Freddie Highmore (in The Good Doctor and Bates Motel), Aidan Gallagher (Number Five in The Umbrella Academy), and Jack Griffo (Max Thunderman in The Thundermans). He also dubbed the role of Miguel Diaz in Cobra Kai and Freddy Freeman in the film Shazam!.