Jun Ōsuka, whose name in Japanese is written as 大須賀純, is a Japanese voice actor born on May 24 in Fukuoka Prefecture, Japan. Details regarding his birth year are not made public, but he started his career in the entertainment industry during the 1990s. He is affiliated with the talent management agency Amuleto, having been previously associated with Mausu Promotion before becoming a freelancer and then joining his current agency in 2014.

Ōsuka began working in anime in the late 1990s, with one of his first roles being Tenkuu Jōro in the 1998 series "Hanasaka Tenshi Tenten-kun". Throughout the 2000s, he built a steady career with supporting roles in various series, including "The Prince of Tennis," where he voices Senri Chitose. This role would become one of his most enduring, as he has continued to voice Chitose across multiple anime series, OVAs, and video games for over a decade. The example provided of him playing Senri Chitose in "The Prince of Tennis OVA: Another Story - Kako to Mirai no Message" is a part of this long-running franchise role.

He is widely recognized for his work in franchises adapted from popular Japanese video games. He plays the role of Hakata Tōshirō in the "Touken Ranbu" anime adaptations, including the first series "Touken Ranbu: Hanamaru" (2016) and its sequel "Zoku Touken Ranbu: Hanamaru" (2018). His other significant recurring role is Shunsuke Yoshino in the series "Sanrio Boys".

Beyond the specific examples mentioned, Ōsuka has a number of other notable roles. He is known as the voice of Mika Kagehira in the multimedia franchise "Ensemble Stars!", Flannel in "Fire Emblem Heroes", and as the title character PJ Berry in the children's series "PJ Berry no Mogumogu Munyamunya". His voice acting work extends to video games, where he has voiced characters in titles such as "Corpse Party: Blood Drive" and the "D.C. Girl's Symphony" series.