Nerea Alfonso Mercado is a Spanish voice actor based in Barcelona, primarily known for her work dubbing foreign productions into Spanish for television and film. Her professional focus is on dubbing, the process of replacing the original dialogue of live-action and animated content with a translated and localized track for Spanish-speaking audiences.

Alfonso's path to voice acting was rooted in her academic background in journalism and her experience in radio, which fostered her interest in audio entertainment and sound fiction. In 2011, she began formal training at the Barcelona Dubbing School while simultaneously studying acting at the Aula de Teatre de Mataró. She further specialized in the field by completing a master's degree in audiovisual translation at the Autonomous University of Barcelona in 2013.

Alfonso's career spans a variety of media, including animation, live-action films, television series, and video games. A significant milestone was providing the Spanish voice for the titular princess in The Legend of Zelda: Breath of the Wild. This role was particularly notable as it marked the first time a mainline game in the legendary franchise was fully voiced.

In the realm of anime, her work is often associated with characters originally voiced by Japanese actress Ayane Sakura. This includes the role of Natalia Garnet in the Netflix series Levius and Aina Ardebit in the film Promare from Studio Trigger. She is also recognized for voicing Sakura Haruno in the redub of the long-running series Naruto Shippuden.

Her dubbing credits extend to a wide range of popular international productions. She has contributed Spanish voices to films such as the live-action adaptations of Black Widow, Parasite, The Suicide Squad, The Nun, and Pirates of the Caribbean: Dead Men Tell No Tales, as well as the Steven Spielberg film Ready Player One. In addition to animation and live-action dubbing, Alfonso has also been involved in narrating audiobooks.