Anzu Nagai is a Japanese former actress and voice actor born on September 19, 1992, in Kanagawa Prefecture, Japan. She began her career in the entertainment industry at a young age, entering the Tokyo Children's Theatre in 1996 when she was four years old. Nagai was affiliated with the agency TOPCOAT before later moving to Flash Up.

Nagai's voice acting work includes several notable anime roles. She is recognized for providing the voice of Daisy in the 2005 film One Piece: Baron Omatsuri and the Secret Island. Another significant role in the One Piece franchise was voicing the character Nico Robin as a child in the main television anime series. Her other voice credits include the character Ume-chan in the television anime Laugh's Beginning from 2000 and providing the Japanese dub voice for the protagonist Kaisa in the overseas drama My Pet is a Cow Named Pearl in 2004.

Beyond her voice work, Nagai built a career as a child actor appearing in numerous Japanese television dramas. Her filmography includes roles in popular series such as Kamen Rider Kuuga in 2000, the historical drama Musashi in 2003, The Queen's Classroom in 2005, and the taiga drama Komyo ga Tsuji in 2006 where she played the childhood version of the lead character. She also appeared in the 2003 film Godzilla vs. Mechagodzilla. Nagai demonstrated an interest in drawing and illustration, and her artwork was featured in the drama Nikoniko Nikki. After a period of career inactivity beginning in 2011, Nagai announced the conclusion of her entertainment activities in January 2013.