Sayoko (written: 小夜子, 紗代子, 佐代子, 沙代子, 彩世子 or 咲世子) is a feminine Japanese given name. Notable people with the name include:

, Japanese kirikane artist , Japanese actress , Japanese actress and gravure model , Japanese singer-songwriter and actress , Japanese archer , Japanese sports journalist and television announcer , Japanese actress and model , Japanese butoh dancer, choreographer and master Sayoko Takami, a victim of the Ōmuta murders , Japanese model , Japanese model and actress

Fictional characters , a character in the manga series Oh My Goddess! , a character in Gallery Fake , a character in RahXephon , a character in the anime series Code Geass , a character in The Idolmaster Million Live! , a character in Rokubanme no Sayoko