Mitsuki Saiga (斎賀 みつき, Saiga Mitsuki, born June 12, 1973) is a Japanese voice actress and singer affiliated with Ken Production. Her major roles include Tsukasa in .hack, Maria Ross in Fullmetal Alchemist, Rossiu Adai in Gurren Lagann, MakubeX in GetBackers, Wolfram von Bielefeld in Kyo Kara Maoh!, Chie Harada in My-Hime and My-Otome,

Teito Klein in 07-Ghost, Jomy Marcus Shin in Toward the Terra, and the eponymous character in Jing: King of Bandits. Her deep voice is used to play male or masculine female characters. She won a Best Supporting Actress Award at the 2nd Seiyu Awards for her work in Moyasimon: Tales of Agriculture, Gurren Lagann, and Toward the Terra. She also won the Overseas Fan Award at the 4th Seiyu Awards for her portrayals of Wolfram in Kyo Kara Maoh! and Souji Okita in Peacemaker Kurogane. As the band Mitsuki Saiga feat. Just, she released several albums and singles that have charted on Oricon.