Kazue Sawai (沢井一恵, Sawai Kazue, born 1941 in Kyoto) is a Japanese koto player noted for her performance of contemporary classical music and free improvisation.

She began studying, at the age of eight, with Michio Miyagi. She later graduated from the Tokyo National University of Fine Arts and Music.

She plays both the 13-string and 17-string kotos. As a soloist, as well as with her koto ensemble, she has performed and worked with John Cage, Toshi Ichiyanagi, Yuji Takahashi, Ayuo, Roberto Carnevale, Sofia Gubaidulina, David Behrman, Carl Stone, and many other composers. She has performed in Japan, North America, and Europe.

She was married to the late Tadao Sawai, who was also a koto player and composer. The couple had a son Hikaru Sawai (b. 1964), who is also a koto player and composer.

She operates a school in Japan, where she teaches both Japanese and foreign students. Her students include Michiyo Yagi, Elizabeth Falconer, Shoko Hikage, and Mei Han.