Kiyoshi Komiyama is a Japanese actor and voice actor born on January 12, 1937, in Tokyo, Japan. He began his career in entertainment as a child actor, initially joining the theater group Gekidan Teatro Piccolo in 1945 before moving to Gekidan Komadori in 1948 where he became active in radio dramas and stage productions. After leaving the theater group in 1957, he affiliated with Tokyo Actor's Consumer's Cooperative Society in 1959 and later worked with Dojinsha Productions before becoming a freelance talent.

Komiyama's voice is characterized as a tenor, and he frequently utilized his higher vocal range to portray child and adolescent male characters throughout his career. He was often cast in leading and principal roles in feature films and television anime produced by Toei Animation. His career in voice acting spans from the late 1950s and 1960s, the early era of Japanese television animation, through to the 1990s and beyond.

His extensive list of anime credits includes several leading roles from the 1960s. He voiced the title character in Shōnen Ninja Kaze no Fujimaru and Son Goku in the 1960 film Alakazam the Great. He also played Genshoku in Kaminari Boy Pikkaribee and Teruo Aoki in Yuyake Banchō.

In the 1970s, Komiyama continued to secure prominent roles in numerous series. He was the voice of Goemon Koishikawa in Gowapper 5 Godam, Hideki in UFO Senshi Daiapolon II, and Neil Leagan in the long-running series Candy Candy. His work during this decade also included roles such as Hajime Kiseki in Kagaku Bōkentai Tansar 5 and Takechiyo Matsudaira in Shōnen Tokugawa Ieyasu.

His career extended into the 1980s and beyond with notable performances in major franchises. He voiced Hackle in the mecha anime series Fang of the Sun Dougram and its compilation film, and Bob in Space Cobra. He also took on guest roles in different iterations of the GeGeGe no Kitarō series, including the 1985 television series and the 1986 film GeGeGe no Kitarō: The Most Powerful Yokai Army Corps! Assault on Japan!!. Later in his career, he provided the Japanese voice for the character Piglet in various Winnie the Pooh media from the 1990s and early 2000s.