Haruka Kaji (born 25 September 1994) is a Japanese professional tennis player.
Kaji has a career-high singles ranking of 283, achieved on 29 January 2018.
She also has a career-high WTA doubles ranking of 156, set on 23 September 2019.
Kaji won her biggest ITF title to date at the 2019 Challenger Banque Nationale de Granby.