Haruka Kaji (加治 遥, Kaji Haruka, born 25 September 1994) is a Japanese professional tennis player.

She has career-high WTA rankings of 213 in singles, achieved on 25 September 2023, and 131 in doubles, set on 3 February 2020.

Kaji won her biggest ITF title to date at the 2019 Challenger de Granby, in the doubles tournament, partnering Ingrid Neel.

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