Kazuhiro Yamaji is a Japanese actor and voice actor affiliated with the theatre company Gekidan Seinenza. He was born on June 4, 1954, in Mie Prefecture. His career spans both on-screen acting and voice work in animation and video games.

Yamaji's acting career includes roles in television dramas and films. He has appeared in the Taiga dramas for NHK, including Gunshi Kanbei, Kirin ga Kuru, and Idaten. His film credits include The Emperor in August and Kakekomi. In the tokusatsu genre, he is known for his role as Professor Kaijima in Kamen Rider Blade and for providing the voice of Emperor Yodon in Mashin Sentai Kiramager and Goma Rosalia in Ohsama Sentai King-Ohger.

As a voice actor, Yamaji is known for his deep and resonant voice, often cast in roles that require authority, wisdom, or menace. In the world of anime, he has portrayed a wide range of characters. Among his most prominent recent roles is Henry Henderson, the elegant and strict housemaster at Eden Academy in the popular series Spy×Family. He also voices the seasoned martial arts master Silverfang in One Punch Man and the time-skipping assassin Hit in the Dragon Ball Super series and related projects like Super Dragon Ball Heroes. His filmography includes the role of Kojiro Sasaki in Record of Ragnarok, Bernard Symons in High Card, Rao in SAND LAND: THE SERIES, Kenny Ackerman in Attack on Titan, and the second voice of Heizo Hattori in the long-running Case Closed franchise.

His work extends to video games, where he is the consistent Japanese voice of Geralt of Rivia in The Witcher series. He also voices Kazuya Mishima in Tekken: The Motion Picture and Cid Highwind in Final Fantasy VII: Advent Children. In the live-action film adaptation of the Phoenix Wright: Ace Attorney video games, he played the role of the judge.

Yamaji is married to fellow voice actress Romi Park. In recognition of his work in theatre, he has received the Kikuta Kazuo Theatre Award. His continued presence in both new and ongoing anime series, such as the third seasons of One Punch Man and Spy×Family, demonstrates his enduring relevance and demand in the voice acting industry.