Kazuki Miyagi is a Japanese voice actor born on May 29, 1993, in Tokyo, Japan. He is affiliated with the talent agency 81 Produce. Miyagi began his professional career in 2018 after winning both a Special Prize and the JOYSOUND Prize at the 9th 81 Audition, a notable achievement for a newcomer in the industry.

In his early years, Miyagi built his career by taking on a wide variety of supporting and minor roles across numerous anime television series. His filmography from this period includes appearances in Zombie Land Saga, Ace Attorney, Given, and Carole & Tuesday. He quickly became a frequent presence in anime, lending his voice to a range of characters, from background students to more defined supporting parts. This period of building a broad foundation of work continued into the early 2020s, with roles in popular series such as Tokyo Revengers, The Misfit of Demon King Academy, and Burning Kabaddi.

Miyagi's versatility is demonstrated by his ability to take on roles in various genres, from the rap-centric Ya Boy Kongming! to the fantasy of The Ancient Magus' Bride. His personal hobbies, freestyle football and freestyle rap, are interests that align with some of his more energetic and rhythm-focused roles. In 2024, Miyagi was cast as Resshin in the anime adaptation of the manga Sengoku Youko, a role that represents a more prominent character in a major series. He also appears in the 2024 anime series Astro Note and Viral Hit.

Beyond anime, Miyagi's voice work extends to other media. He has provided voices for acclaimed video games such as Final Fantasy VII Remake and Demon Slayer: Kimetsu no Yaiba - The Hinokami Chronicles. His credits also include audiobook narration, drama CDs, and Japanese dubs for foreign films and animation.