Yuka Koyama is a Japanese voice actress affiliated with the talent management firm Aoni Production. She was born on February 9, 1968, in Hiroshima Prefecture, Japan. Her career in the entertainment industry began in 1988 following her graduation from the Osaka branch of the Aoni Juku training school, the Osaka University of Arts Junior College.

Koyama has built a diverse portfolio of voice work across animation, video games, and foreign language dubbing. She is recognized for several significant anime roles, including Miyako Miyazawa in the television series His and Her Circumstances, Kaoru Miyamoto in Goal FH, and Seerry Farson in the OVA series Tenbatsu Angel Rabbie. Her film work includes providing the voice for Sadako in the 1993 animated film On a Paper Crane - Tomoko's Adventure. In the OVA format, she voiced Yukie in Ogre Slayer, Kiki Lamia Windau in Vampire Wars, and the BSX-03 Mega Driver AI in Battle Skipper. A more recent prominent role is Yoko Yamaguchi in the 2005 OVA Pale Cocoon. Her television anime credits also extend to long-running series such as One Piece, where she voices the character Sadie, and Dragon Ball Z.

In the realm of video games, Koyama is perhaps best known for her long-standing role as Helena Douglas in the Dead or Alive series, a part she has played from Dead or Alive 2 in 1999 to the most recent installments. This role represents a significant recurring collaboration with game developer Koei Tecmo. Another notable game credit is as Ferham in Mega Man X: Command Mission. Her voice work has also extended to other media, including narrating for television programs and providing Japanese-dubbed voices for foreign actors, such as the voice for actress Ning Jing in the Japanese broadcast of the drama Shanghai Bund.