Shinnosuke Musashi is a Japanese voice actor born on December 7 in Kyoto Prefecture, Japan. He is affiliated with the talent agency Ken Production and is a graduate of the training school School Duo, where he was a member of the sixteenth class. In addition to his voice acting work, he is also a member of Kenken Park, a group of voice actors who specialize in live readings of picture books for children.

Musashi's career began in the 2010s, and he has since built a diverse portfolio of roles across television anime, animated films, video games, and foreign drama dubbing. In the world of film, he has contributed to major theatrical releases, including Makoto Shinkai's Weathering With You and the feature film Made in Abyss: Dawn of the Deep Soul. His other notable film credits include Pretty Cure All Stars: Singing with Everyone♪ Miraculous Magic! and Evangelion: 3.0+1.0 Thrice Upon a Time. On television, he has played a variety of supporting roles in long-running and popular series such as Case Closed, My Hero Academia, Attack on Titan, The Rising of the Shield Hero, and the franchise Shinkalion.

He portrayed the role of Mousse, the King of the Mouse Kingdom, in the 2024 anime feature film Rabbits Kingdom the Movie. This film is part of the Tsukiuta franchise. His other voice work includes roles in video games such as Sangokushi Taisen and Honkai Impact 3rd, as well as providing Japanese dubbing for foreign media.

Outside of his voice acting, his known skills and hobbies include holding a second-dan rank in kendo, as well as an interest in visiting hot springs, driving, e-sports, and watching martial arts. He is also known for his enthusiasm for cars, enjoying both driving and inspecting their engines. There is no specific information regarding major awards or accolades.