Atsuyoshi Miyazaki is a Japanese actor and voice actor born on February 3, 1966, in Fukuoka Prefecture. Before entering the entertainment industry, he worked as a graphic designer and later as a certified caregiver and after-school care worker. His stage career included roles in theatrical productions such as One Flew Over the Cuckoo's Nest and adaptations of works by authors like O. Henry and Junichiro Tanizaki. On March 16, 2015, he joined the agency Ken Production, marking a significant transition into voice acting. His debut anime role was Hirasawa in the series Ajin.

Miyazaki has voiced a wide range of supporting characters across television anime, films, and video games. In addition to Hirasawa in Ajin, his notable anime roles include Skears in Shironeko Project: Zero Chronicle, Rudolph Fibel and Zest De Noir in Akashic Records of Bastard Magic Instructor, Inoue in Lupin the 3rd: Goemon's Blood Spray, and appearances in My Hero Academia, Crayon Shin-chan, Re:CREATORS, and the Japanese dub of the Chinese series The Outcast. He also appeared in the film Lu Over the Wall and provided voices for Thermae Romae. In video games, he is known for voicing Master Kohga in The Legend of Zelda: Breath of the Wild. His dubbing work for foreign films and series includes roles in Avengers: Endgame and Pirates of the Caribbean: Dead Men Tell No Tales.

Miyazaki is known affectionately by fans and colleagues as Tonkichi. His theatrical performance in Jintama Kibyoshi won the 26th Matsuo Performing Arts Award. In 2023, a commercial featuring him won the Gold Prize at the 77th Dentsu Advertising Film Awards. He continues to work as a freelance voice actor across anime, games, dubbing, and commercial narration.