200 m: 23.78 (2020) 300 m: 38.09 (2017) Sayaka Oishi (大石 沙也加, Ōishi Sayaka, née Fujisawa (藤沢), born 11 March 1991 in Takizawa, Iwate) is a Japanese sprinter.

She finished fourth in the 4 × 400 metres relay at the 2015 Asian Championships.

She was also the reserve relay member at the 2019 World Relays but was not selected to run.

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