Kyōko Nagatsuka (Japanese: 長塚京子, born February 22, 1974) is a Japanese former professional tennis player.

[1] Nagatsuka reached three singles finals on the WTA Tour but failed to win the title in any of them.

She reached the fourth round of a Grand Slam tournament twice in singles: at the 1995 Australian Open, where she beat a young Martina Hingis and Amy Frazier, and that same year at the French Open.

Playing for the Japan Fed Cup team, she has a win–loss record of 2–4.

Since her retirement, she has briefly worked as a coach with Akiko Morigami.