Saya Kazuki is a Japanese actress and voice actor born on July 23, 1983, in Kusatsu, Shiga Prefecture, Japan. She began her entertainment career in 2001 as a member of the idol group Hop Club and gained early recognition after winning the Miss Magazine Grand Prix in 2002. Initially affiliated with Horipro, she later moved to Tom Company.

In voice acting, Kazuki is known for her role as the titular character Digi Girl in the 2003 anime television series Digi-girl Pop!. For this series, she also performed the ending theme song, Uhyo Uhyo Pop!. Another notable anime role was Yurina Kanda in the 2006 series Kekkaishi. She also provided the voice for Sapphire Princess in an episode of Kochira Katsushika-ku Kameari Kōenmaehashutsujo in 2005 and voiced a character in the 2016 anime film Chieri to Cherry. Her live-action acting career includes appearances in television dramas such as Case Closed as Ayaka Nizuma, Saikou no Rikon, and the film Sakamichi no Ie.

Beyond acting, Kazuki made her writing debut in 2009 with a children's mystery novel titled Uranai × Tantei, for which she created the characters and settings.