Momiji Nishiya

is a Japanese skateboarder. At the 2020 Summer Olympics, she won the first ever gold medal in the women's street competition. Winning at the age of 13, she is the youngest person ever to win a gold medal for Japan, and the third youngest after Marjorie Gestring and Klaus Zerta to ever win an event at the Summer Olympics.

Career Nishiya competed at the 2019 Summer X Games in the women's street event where she scored 90.00 and won a silver medal.

Nishiya competed at the 2021 Street Skateboarding World Championships where she scored 14.17 and won the silver medal.

As of June 2021, Nishiya was ranked fifth in the Olympic World Skateboarding rankings, and qualified for the 2020 Summer Olympics. She competed in the women's street competition, where she scored 15.26 and won the gold medal. At the age of 13 years and 330 days, she became the youngest Olympic gold medalist for Japan, and the third youngest gold medalist in Olympic history.

Nishiya competed at the X Games California 2023 in the women's street event where she scored 86.66 and won a bronze medal. She failed to qualify for the 2024 Summer Olympics. In September 2024, she won a silver medal at the World Skateboarding Championship.

In February 2026, following her graduation from Osaka Gakugei High School, she announced her intention to forgo university enrollment and pursue a career as a professional skateboarder and focus on training for the 2028 Summer Olympics.