Ernesto Mascarua is a Mexican voice actor known for his work in Latin American Spanish dubs of anime series and films. He has built a career participating in numerous productions for streaming platforms and studios specializing in anime localization.

Mascarua's voice acting credits encompass a range of leading and supporting roles. He is recognized for voicing Mika, a central character in the series Drifting Dragons. Another early role was as Younger Brother in the OVA Coicent. He has also taken on prominent parts such as Ken Kaido in Mazinkaiser SKL and Adam Arclight in Needless.

His film work includes voicing Roger in the animated feature Pets United and participating in major film dubs like The First Slam Dunk, where he voiced Chuichiro Noma, and The Boy and The Beast. His credits also extend to popular franchises and series, with roles in Cyberpunk: Edgerunners, Komi Can't Communicate, Kotaro Lives Alone, Record of Ragnarok, the 2021 Shaman King, and Star Wars: Visions. In 2022, he was also credited among the voice cast for the Shinobi no Ittoki dub.