Juan Diéguez is a Spanish voice actor known for his work in Latin American Spanish dubs of anime and animated series. He is recognized within the anime community for providing the voice for characters in several high-profile productions. In the 2018 fantasy anime series Lost Song, Diéguez voiced the character Talgia Hawkray in the Latin American Spanish dub. His role in this series also included voicing another character, Berow, for the same dub.

Beyond Lost Song, Diéguez's portfolio includes roles in other notable anime titles. He voiced the character Bosha in the 2017 Netflix original series Castlevania. That same year, he was cast as Serge in the anime adaptation of Fate/Apocrypha and as Oyassan in the film adaptation of the manga BLAME!. His work is not limited to Japanese animation; he has also participated in dubs for Western franchises, such as providing a voice for the animated series Beast Machines: Transformers.