Kumiko Koiwai (born June 27, 1975 in Ōbu, Japan) is a former Figure skater from Japan. She won the World Junior Figure Skating Championships in 1993. Coached by Machiko Yamada, who had trained Midori Ito, Koiwai was routinely landing the Triple axel jump by 1994. However, she faced several chronic injuries on her right foot, which severely impeded her efforts. This prompted her to drift away from the world of skating after the 1995 season. Like Ito, she graduated from Tokai Women's College near their hometown, Nagoya. Koiwai now works as a programming director for Tokai Television in Japan.