Keisuke Fujii is a Japanese voice actor born on November 27, 1975, in Toyama Prefecture. He is a graduate of the Office Kaoru Voice Actor Training Institute, where he was part of its fifth term. Fujii is currently affiliated with the talent management firm Kenyu Office. He possesses a baritone vocal range.

Fujii's career encompasses a wide array of roles in anime, video games, and dubbing for foreign films and television series. In anime, he is known for playing the character Ajitaro in the 2007 comedy series My Bride is a Mermaid (Seto no Hanayome), a role he also reprised in subsequent OVA episodes. His other notable anime credits include Sato Koichi in NANA, roles in the CLANNAD series, a young猿飞蒜山 in Naruto Shippuden, and various characters in series such as S.A.特优生 and 隐之王. He also voiced Shuuichi Kasai in Delicious Party Pretty Cure.

In the field of video games, Fujii has contributed his voice to several major titles. He is recognized for his work as Marshall Law in Street Fighter X Tekken, as Sun Quan in Romance of the Three Kingdoms XIII, and as the character长 in CLOCK ZERO ~終焉の一秒~ and its subsequent versions.

A significant portion of Fujii's work is in the area of dubbing, where he provides the Japanese-language voice for foreign actors. He is a frequent voice for actors such as Bradley Cooper, including roles in Yes Man and Case 39, and Jonathan Rhys Meyers, notably in Alexander. He also dubbed the role of Chad Lee, the Blue Ranger, in Power Rangers: Lightspeed Rescue and has provided voices for Korean dramas, including the lead role of Seo Gon-woo in The Snow Queen.