Mercedes Cepeda is a Spanish voice actor known for her work in anime dubbing, particularly for the European Spanish market. Her career encompasses roles in major animated films and long-running television series.

Cepeda provided the voice for the character Lisa in the Studio Ghibli film Ponyo on the Cliff by the Sea. She performed this role for the film's original 2009 Spanish dub and also for a subsequent 2020 re-dub produced for Netflix. Her involvement with the works of Hayao Miyazaki extends to another Studio Ghibli production, as she is also credited with voicing a character in The Wind Rises.

In addition to her film work, Cepeda has had a significant presence in the Pokémon anime series. She voiced the character Rachel, the wife of an astronaut and mother of the Mossdeep City Gym Leaders Tate and Liza, who appeared in multiple episodes of the series. Her other roles in the Pokémon franchise include Luka Carson, a bus driver in the television special Mewtwo Returns.

Throughout her career, Cepeda has frequently collaborated with a consistent group of voice actors in the Spanish dubbing industry. Available data indicates that she has worked alongside Roberto Encinas more than any other performer, with over a dozen shared projects. Other frequent collaborators include Juan Amador Pulido, Fernando Hernandez, Rafael Azcarraga, and Alejandro Garcia. This pattern of recurring team-ups is characteristic of the close-knit nature of the dubbing community.