Yuka Sadaka (born 2 November 1994) is a Japanese rugby union player. She competed for at the 2021 Rugby World Cup. Rugby career Sadaka started playing rugby in her first year of junior high school.

She earned her first cap for in May 2014 in the Asian Championship match against .

In 2022, she scored one of two tries in the Sakura's historic match against the Black Ferns before the World Cup. She was selected in Japan's squad for the delayed 2021 Rugby World Cup in New Zealand.

She featured for Japan at the inaugural WXV 2 tournament in 2023.

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