Shizune Nagao is a Japanese actress and model known for her role in the hybrid live-action and anime television series Aikatsu! Planet. She was born on August 17, 1995. Nagao began her career in entertainment at a young age, having been selected as the grand prize winner from approximately ten thousand participants in the Stardust Promotion Entertainment Division 3 audition in September 2007 when she was twelve years old.

Her most prominent voice acting role to date is Kyōko Umekōji, along with her in-universe avatar Beat, in the 2021 television series Aikatsu! Planet. This series is part of the larger Aikatsu! franchise and uniquely combines live-action segments with computer-generated animation for scenes set within the "Aikatsu Planet" world. Nagao's casting in this lead role was announced in August 2020. She reprised this character for the subsequent film, Gekijō-ban Aikatsu Planet!, which was released in Japan on July 15, 2022.

Beyond her work in the Aikatsu! franchise, Nagao's career includes appearances in stage productions. She starred in the stage adaptations of the manga and anime series Blood Blockade Battlefront, specifically in Blitz Along Alone and Beat Goes On. Information regarding her other potential voice acting credits is limited, and her professional profile indicates a broader focus on live-action performance and modeling.