The 2015 Japan Women's Open was a women's tennis tournament played on outdoor hard courts. It was the seventh edition of the Japan Women's Open, and part of the WTA International tournaments of the 2015 WTA Tour. It was held at the Ariake Coliseum in Tokyo, Japan, from September 14 through September 20, 2015. The tournament was moved from Osaka to Tokyo starting this year. Unseeded Yanina Wickmayer won the singles title.
<sub><sup>1</sup> Qualifiers prize money is also the Round of 32 prize money</sub>
The following players received wildcards into the singles main draw:
The following players received entry from the qualifying draw:
The following pairs received wildcards into the doubles main draw: