Adrián Mier is a Spanish voice actor known for his work in dubbing, primarily for Spanish-language versions of films and television series. He is professionally active and specializes in voicing young characters. His most recognized role in anime is providing the Spanish voice for Hyuga Hizashi in the series Beyblade Burst Sparking, also known as Beyblade Burst Surge in Spain. This role, where he voices the original character performed by Natsumi Fujiwara, is part of the Spain dub produced by SDI Media Spain under the direction of Jaime Roca.

Beyond his anime work, Mier has an extensive career in dubbing for live-action and animated productions. His film credits include voicing Bobby in the Spanish (Spain) dub of Logan and Picobrillo (Brightbill) in The Wild Robot. He has also dubbed numerous other characters, such as Darius Bowman in multiple seasons of Jurassic World: Camp Cretaceous, Bunga in The Lion Guard, the title role in Kubo and the Two Strings, and Carlitos Brown (Charlie Brown) in The Peanuts Movie.

His dubbing work often involves providing the Spanish voice for a recurring set of international actors. This includes roles performed by Joshua Rush (Bunga in The Lion Guard, Waldo in Where's Waldo?), Paul-Mikél Williams (Darius Bowman in Jurassic World: Camp Cretaceous), and Kit Connor (Brightbill in The Wild Robot). His consistent activity and the range of his credits, from major animated features to live-action series, establish him as a working professional in the Spanish dubbing industry.