Yoko Shibui (渋井 陽子, Shibui Yōko, born March 14, 1979 in Kuroiso, now Nasushiobara, Tochigi) is a long-distance runner from Japan, who is competing in the 5000 and 10,000 metres as well as the marathon race. She holds the Japanese record over 10,000 m with her best time of 30:48.89 minutes. Shibui is one of only a handful of women to have completed the marathon under two hours and twenty minutes – her personal best of 2:19.41 ranks her within the top ten fastest ever.