|Date of birth:||December 1, 1943|
|Place of birth:||Maizuru, Kyoto (Japan)|
|Voice of:||Heizo Hattori, Osamu Kamei and Taiji Tatsumi|
Takehiro Koyama (小山 武宏 Koyama Takehiro), born on December 1, 1943, and age 75, is a voice actor from Maizuru, Kyoto Prefecture.
In Detective Conan, he voiced Heizo Hattori until in 2017, when his deal with Yomiuri TV ended. He was replaced by Kazuhiro Yamaji. He was chosen since he was from Kansai and had to voice an actor that talked with the Kansai dialect. He also voiced a few minor characters prior to voicing Heizo.
He also voices numerous characters in other series such as Cowboy Bebop, Ao no Exorcist, Ghost in the Shell or Code Geass.