Jin Ogasawara is a Japanese voice actor and singer from Kanagawa Prefecture, born on August 16, 1994. He is affiliated with the talent agency EARLY WING and stands 174 cm tall with blood type O. His path to becoming a voice actor was inspired by his deep appreciation for anime and games, particularly the visual novel Fate/stay night by TYPE-MOON, which he credits as the direct catalyst for his career choice.

Ogasawara made his debut in the voice acting industry in 2016 with a role in the mobile game Kisei no Rebellion. He continued to build his resume with minor roles in television anime and various video games over the following years. A pivotal moment in his career arrived in 2019 when he was cast as the voice of Nayuta Asahi, the lead vocalist of the band GYROAXIA, within the mixed-media project ARGONAVIS from BanG Dream!. This role became a significant breakthrough, as he not only voiced the character in anime and game adaptations but also performed as the lead singer of GYROAXIA in live concerts and musical recordings.

His involvement with the ARGONAVIS project has been extensive and recurring. He has portrayed Nayuta Asahi across multiple installments, including the television anime ARGONAVIS from BanG Dream! which began in 2020, the smartphone game ARGONAVIS from BanG Dream! AAside, and the theatrical films Gekijōban Argonavis: Ryūsei no Obligato and Gekijō-ban Argonavis Axia. This role also led him to the stage, appearing in the 2021 production ARGONAVIS the Live Stage.

Beyond his signature role in ARGONAVIS, Ogasawara has built a diverse portfolio of anime characters. He voiced Shō Akitsuki in the surfing-themed project WAVE!! -Let's go surfing!!- across both its 2021 television anime and 2020 theatrical films. In 2021, he played the role of Awaki in the critically acclaimed anime SSSS.Dynazenon. He has also become a recurring presence in the Cardfight!! Vanguard franchise, first voicing Raika Koshiba in the 2022 series Cardfight!! Vanguard will+Dress and later reprising the role in Cardfight!! Vanguard Divinez Deluxe-hen. Additionally, he provided the voice for Jindō Kiriya in the web anime Inō no Aicis (known as "異能のアイシス" or "Isei no AICis"). Other notable anime credits include roles in The Dangers in My Heart, Helck, and a wide range of video games such as Granblue Fantasy, Final Fantasy VII Rebirth, and multiple titles in the Blackstar -Theater Starless- franchise.

Parallel to his voice acting, Ogasawara has pursued a solo music career. He made his solo artist debut in May 2021 with the single TURBO under the Beyond The Music label. His solo releases, including singles and the album Sokai Gyou Ressha, have charted on Oricon. As the frontman of GYROAXIA, the band made their major-label debut in 2022 with the mini-album Freestyle under Universal Music's Virgin Music label. His powerful and technically skilled singing, capable of handling rap, shouts, and screams, has earned him high praise and recognition, leading to performances at major events like Animelo Summer Live.

Ogasawara is known for his versatility, extending his work to dubbing foreign films, such as providing the Japanese voice for actor Yi Yangqianxi's character in the film The Battle at Lake Changjin. He has also been active in radio programs, drama CDs, and digital comics. His personal interests include drawing, creating hairstyles, and playing mahjong. A self-identified otaku, he is open about his passion for anime and games, even once dyeing his hair red to show his fondness for a character from the Love Live! series. In 2023, he announced a pause in his solo activities under the Beyond The Music label to focus on creative pursuits, though he continues his work as a voice actor and his collaborative projects.