Kōki Okada, also known as Kohki Okada or Kouki Okada, is a Japanese actor and voice actor born October 26, 1965 in Gunma Prefecture. Standing 178 centimeters tall with blood type O, he is affiliated with the talent agency serve promotion. Okada initially pursued a music career, debuting as the vocalist of the band To Be Continued in 1991 before transitioning into acting. He is primarily known as a live-action film and television actor, with his voice acting work representing a smaller portion of his overall career.

Okada is best known in animation for his role as Rock in the 2001 science fiction anime film Metropolis, directed by Rintaro and based on the manga by Osamu Tezuka. In Metropolis, Rock is the violent and impulsive son of the powerful Duke Red, who distrusts robots and seeks to destroy the advanced robot Tima. The voice cast for the film also included Yuka Imoto as Tima, Kei Kobayashi as Kenichi, and Taro Ishida as Duke Red. This role remains his most widely recognized anime credit.

Beyond Metropolis, Okada has contributed voice work to the live-action superhero film series Kamen Rider, providing voice acting for Kamen Rider Fourze the Movie: Everyone, Let's Go to Space! in 2012 and Kamen Rider × Super Sentai × Space Sheriff: Super Hero Taisen Z in 2013. Available information does not indicate recurring collaborations with specific animation studios, directors, or other voice actors, and his animation voice credits beyond these titles are not documented in major film databases. While Okada received a nomination for Best Supporting Actor at the 6th Nikkan Sports Drama Grand Prix (also known as the Drama Academy Awards) for his live-action role in the 1995 television series Aishiteiru to Ittekure (translated as Tell Me You Love Me), he has not received widely documented awards or nominations specifically for his voice acting performances.