Yoko Ishida (石田 燿子, Ishida Yōko?, born October 7, 1973 in Niigata, Niigata Prefecture) is a Japanese singer. She is known for having performed theme songs for anime shows such as Prétear, Ai Yori Aoshi, the Ah! My Goddess TV series and the Strike Witches series, as well as for having sung for the Para Para Max CD series. She currently works under Solid Vox. Formerly she was employed by Hyper Voice Managements.
Ishida entered the entertainment industry after winning a contest to become an anime song singer in 1990. She made her debut in 1993 with the song "Otome no Policy" ("Maiden's Policy"), the ending theme for the Sailor Moon R anime. At the time her name was written as 石田よう子, but she changed it to the current spelling (石田燿子) after signing up with record label Pioneer LDC (now Geneon Universal Entertainment). She has since moved back to her original label, Nippon Columbia. Apart from anime songs, she has also sung children's songs.
She married in 2008 and gave birth to her first child the following year.