Tokuyoshi Kawashima is a Japanese voice actor born on February 8, 1973, in Tokyo, Japan. He is affiliated with the talent agency 81 Produce. Kawashima is a graduate of the Yoyogi Animation Academy in Tokyo. He was inspired to pursue a career in voice acting after watching the anime Tekkaman Blade. In addition to his voice work, he has experience as a stage actor and was a member of the Dramatic Company led by Ryusei Nakao and Toshihiko Seki.

Kawashima's career in animation began in the 1990s, with one of his earliest roles being Takayasu Takada in the 1996 television anime You're Under Arrest!. Since then, he has built an extensive and varied body of work, providing voices for a wide range of characters across numerous television series, original video animations (OVAs), and animated films.

His filmography includes several roles specified by the user. He voiced Hyōma Yoshimura in the 2015 series Concrete Revolutio and its second season. He is known for the role of Detective Naomasa Tsukauchi in the long-running series My Hero Academia, a part he has played since 2016. In Moriarty the Patriot, he voiced Zach Patterson. He also provided the voice for the droid B-20N in the Star Wars: Visions anthology series. Kawashima has a recurring role as Alex Caselnes, a character in the Legend of the Galactic Heroes: Die Neue These series. Other noted roles include Takeshi Iori in Gundam Build Fighters: GM's Counterattack, Itsuki Kohinata in Niji-iro Prism Girl, and Rintaro "Rin Rin" Hayashi in Polar Bear's Café. He also voiced Takamasa Sougi in Corpse Princess: Kuro, Yūtarō Ishii in Psychic Detective Yakumo, and William Jones in the Emma: A Victorian Romance series.

Beyond these, his career highlights include significant roles such as Subaru Imai in Gakuen Alice, Yuichiro Hikari in the Rockman.EXE series, Fujitaka in Tsubasa Reservoir Chronicle, Takamasa Sogi in the Corpse Princess series, Tonio Trussardi in JoJo's Bizarre Adventure: Diamond is Unbreakable, and Wataru in Pokémon Origins. He has also appeared in major film projects, including a role in the 2018 feature Detective Conan: Zero the Enforcer.

Kawashima's work also extends to voice dubbing for foreign films and television series, as well as narration for documentaries and educational programs. His career demonstrates a consistent presence in the Japanese animation industry, contributing his voice to a wide spectrum of characters across different genres and series.