Satoshi Tsuruoka is a Japanese voice actor, stage actor, and narrator born on August 19, 1978, in Kanagawa Prefecture. He is affiliated with the talent agency Remax. In addition to his work under his real name, he uses the alias Itsuki Akiyama for roles in adult games and anime.

Tsuruoka began his career in the mid-1990s, with some of his earliest roles including minor parts in the 1996 anime Rurouni Kenshin. His first major role came in 1997 with the anime Hikarian - Great Railroad Protector, where he voiced the character E4. For many years, he took on numerous minor and supporting roles, building a foundation in the industry.

His career saw a significant rise in popularity following his performance as the Caster, Gilles de Rais, in the 2011 anime Fate/Zero. This role is often cited as his breakthrough, showcasing his ability to portray intense and complex characters. He has since become a prominent voice in the Fate franchise, taking on multiple servant roles including Arash, Spartacus, and Caligula in various series and films such as Fate/Grand Carnival, Fate/Grand Order The Movie Divine Realm of the Round Table: Camelot, and Fate/Apocrypha.

Tsuruoka's career is marked by his wide vocal range and versatility, allowing him to portray a diverse array of characters. In addition to his work in the Fate series, his notable anime roles include the taciturn Munehiro Kabaji in The Prince of Tennis, the villainous Garuouga in Star Twinkle Precure, Zanoba Shirone in Mushoku Tensei: Jobless Reincarnation, the masked man in The Case Study of Vanitas, Gentz in Kuma Kuma Kuma Bear, Sony in Beastars, and General Are in the SAND LAND series. He also voiced Aleksandr Godnov in Cop Craft, Tarmiel in The Seven Deadly Sins: Dragon's Judgement, Gennai Hoshimiya in Big Order, and Isoroku in the High School Fleet series and film.

Beyond anime, Tsuruoka is active in other areas of voice acting. He has a notable role in the tokusatsu genre, providing the voice for the recurring villain Raging Knight Dogold in the 2013 Super Sentai series Zyuden Sentai Kyoryuger. In the gaming world, he is the Japanese voice of M. Bison (known as Balrog in Japan) in the Street Fighter series. He is also prolific in dubbing foreign films and television series, providing Japanese voices for actors such as Channing Tatum, Tom Hardy, and Pedro Pascal. Tsuruoka's extensive filmography, built over decades, reflects his status as a seasoned and respected figure in the Japanese voice acting industry.