Mayumi Miyata (宮田まゆみ, Miyata Mayumi) is a Japanese player of the shō, a traditional Japanese mouth organ.

Miyata was born on April 1, 1954, in Tokyo and graduated from the Kunitachi College of Music, where she majored in piano. While in school, she began studying gagaku music from Ono Tadamaro of the Imperial Household Agency.

Although the shō is generally associated with Japan's ancient gagaku court music, Miyata was among the first players of the instrument to specialize in contemporary classical music. She plays a specially constructed instrument with extra pipes, allowing for the use of more chromaticism.

The US composer John Cage (1912–1992) composed a number of works for Miyata just before his death. Cage met her during the 1990 Darmstadt summer course. She has also premiered works by Tōru Takemitsu, Toshi Ichiyanagi, Maki Ishii, Joji Yuasa, Klaus Huber, Toshio Hosokawa, and Uroš Rojko.

In 2005, Miyata performed in three songs by the Icelandic musician Björk, for the soundtrack album to Drawing Restraint 9, a film by Björk's contemporary media artist boyfriend Matthew Barney, about Japanese culture and whaling. Miyata also appeared in the film, playing the shō in one scene. Previously, a piece written for and recorded by Miyata, "Music for Shō and Harp" by Cort Lippe, was sampled in the Björk single, "Venus as a Boy".

She has performed in Japan, Australia, the United States, and Europe.