Stefannie Arissa Koyama (born 30 June 1995) is a Japanese-born Brazilian judoka.

[1][2] Koyama had won bronze at the All-Japan Judo Championships at Fukuoka in 2016, followed by the East Asian title at 2016 East Asian Judo Championships at Hong Kong.

While representing Japan, Koyama's teamed with Funa Tonaki at Teikyo University but later switched to Brazil in 2017.

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