Niina Hanamiya is a Japanese voice actress from Osaka Prefecture, born on October 24 and affiliated with the talent agency Aoni Production. She made her debut as a voice actress in 2022 with a minor role in the television anime "Soredemo Ayumu wa Yosetekuru".

Hanamiya became interested in the entertainment industry through her background in dance. She began learning classical ballet at the age of five and later studied jazz dance while in high school, with the goal of attending the Takarazuka Music School. Her passion for voice acting was specifically inspired by the "Love Live!" franchise. After an unsuccessful audition to join the group Liella! from "Love Live! Superstar!!", she enrolled in a voice acting training school and successfully auditioned for Aoni Production. She continued to express her interest in the franchise at her agency, which eventually led to her successful audition for the role of Kozue Otomune in the "Love Live! Hasu no Sora Jogakuin School Idol Club" project.

Her most prominent roles include Kozue Otomune in the "Love Live! Hasunosora Girls' High School Idol Club" multimedia project, which encompasses the mobile game "Link! Like! Love Live!" and the film "Love Live! Hasunosora Girls' High School Idol Club Bloom Garden Party". This role represents her major breakthrough as a performer within a school idol unit. In 2025, she voiced the character Atori Mizutori in the anime television series "Bad Girl". Her other early animation credits include minor roles in "Tokyo Mew Mew New" and "Dr. STONE NEW WORLD". Her work in video games includes the character Amazon Tree Boa in "Kemono Friends 3" and Bradamante in "Monster Strike".

Her career is notably defined by her close association with the "Love Live!" franchise, where she works alongside other voice actors from the Hasunosora project, including Runa Tsukine, Kokona Nonomiya, and Kana Sakino. Beyond her voice roles, she has demonstrated her singing abilities as part of the school idol group. She also began hosting her own radio program, "Niina Hanamiya '217find!'," in 2024. She holds a qualification as an instructor in the Ohara-ryu school of ikebana (Japanese flower arranging).