is a Japanese professional footballer who plays as a midfielder for the North Carolina Courage of the National Women's Soccer League (NWSL) and the Japan national team.
On 31 January 2024, Koyama joined Swedish top-tier team DjurgÃÂ¥rdens IF from Cerezo Osaka Yanmar Ladies on a three-year deal.
In January 2025, Koyama joined the North Carolina Courage for an undisclosed fee, signing a three-year contract. The move united her with youth international teammate Manaka Matsukubo. She scored her first NWSL goal in the 89th minute to grab a 1âÂÂ0 win over the Orlando Pride on 19 September 2025.
Koyama made her senior international debut for Japan on 9 October 2022, coming on as a late substitute for Jun Endà  in a 2âÂÂ0 friendly win against New Zealand.
Koyama captained Japan U20 to a runner-up finish at the 2024 FIFA U-20 Women's World Cup.