Sayoko Hagiwara (萩原 佐代子 Hagiwara Sayoko) is a Japanese actress. Her real name is Nomiya Saiko (野々宮佐代子 Saiko Nomiya). She played Ryoko Hoshi (Yullian's human form) in Ultraman 80, and also voiced Yullian as well. In 1983, Sayoko became an actress in the Super Sentai series, Kagaku Sentai Dynaman. Toei was Tsuburaya's rival when it came to Toku.
Sayako Hagiwara married to an unknown man and they had three children but they divorced in 2004. Later, she remarried to Yuu Tokita, who portrayed Kousaku Nangou (DynaYellow) in Dynaman.