Gilberto de Syllos is a Brazilian actor, voice actor, musician, composer, and dubbing director. He was born Gilberto de Syllos Rosa on April 27, 1967, in Campinas, São Paulo, Brazil. He holds a bachelor's degree in music from Campinas State University (UNICAMP). De Syllos is the owner and founder of the dubbing studio Atma Entretenimento in São Paulo, where he also works as a musical and dubbing director, creating Brazilian Portuguese versions for various projects. He is the father of fellow voice actor Renan Alonso.

In the realm of anime dubbing, Gilberto de Syllos is known for his work in several series. He provided the Brazilian Portuguese voice for two characters in the anime Uzaki-chan Wants to Hang Out!: the café owner Akihiko Asai, who is also referred to as "Master" or "Chefe," and the character Akihiko Asai. He voiced the role of the Dwarf Shaman in the second season of Goblin Slayer. In the 2025 anime From Old Country Bumpkin to Master Swordsman, he voiced the characters Allucia's Father and the Town Dojo Master in the Brazilian Portuguese dub.

Beyond his voice acting for anime, de Syllos has a long and established career as a professional musician. He has been a professional bassist and music professor for over 30 years, playing upright bass, bass guitar, and guitar. He has performed and recorded with numerous Brazilian and international artists and has authored several instructional books on bass and Brazilian music, some of which have been released in Europe and the United States. His work as a musician has been recognized with a Prêmio Sharp nomination for his first CD, Tocando Baixo, in 1997.