Mattia Billi is an Italian voice actor born in Rome on December 16, 1996. He is the son of voice actor Stefano Billi, and his full name is Mattia Gajani Billi. Billi has established himself in the field of anime and cartoon dubbing, contributing Italian voice performances to a variety of animated series.

One of his notable anime roles is Bernard Châtelet in the series The Rose of Versailles. In this production, Billi provides the Italian voice for the character, whose original Japanese voice is performed by Miyu Irino. Another significant role is Manjiro in the series DAN DA DAN.

Beyond these roles, Billi has voiced several other characters in animated productions. His credits include Akira in the series Kemono Jihen, Jawbreaker Malto in Transformers, and Val Bilzerian in Big Mouth. Through these performances, Mattia Billi has contributed to the Italian dubbing industry, bringing a range of anime and cartoon characters to Italian-speaking audiences.