Hiroaki Iwanaga is a Japanese model, actor, and voice actor born on November 23, 1979, in Nagasaki Prefecture. He began his career in the entertainment industry in 2000, initially working as a model before transitioning into acting. He is affiliated with the agency G-STAR.PRO.

Iwanaga's career is diverse, spanning live-action television and film, stage performances, and voice acting. He gained significant recognition for his live-action role as Akira Date, who transforms into Kamen Rider Birth, in the 2010-2011 superhero series Kamen Rider OOO. He has since reprised this role in numerous film sequels and specials, including the 2022 film Kamen Rider OOO 10th: The Core Medal of Resurrection.

His most prominent voice acting role began in 2012 when he took over as the voice of Guts for the Berserk: The Golden Age Arc film trilogy. He has continued to voice the character in subsequent anime adaptations, including the 2016 Berserk TV series and the 2022 Berserk: The Golden Age Arc - Memorial Edition, a television edit of the films. This long-running association with the iconic character stands as a major achievement in his voice acting career. While he has voiced other characters, such as in the web anime Ninja Slayer, his work as Guts remains his most notable and sustained voice role.