The 2017 Japan Women's Open (also known as the 2017 Hashimoto Sogyo Japan Women's Open for sponsorship reasons) was a women's tennis tournament played on outdoor hard courts. It was the ninth edition of the Japan Women's Open, and part of the WTA International tournaments of the 2017 WTA Tour. It was held at the Ariake Coliseum in Tokyo, Japan, from September 11 through September 17, 2017.
| Event | W | F | SF | QF | Round of 16 | Round of 32 | width=85 | Q | width=85 | Q3 | width=85 | Q2 | width=85 | Q1 |
| Singles | 280 | 180 | 110 | 60 | 30 | 1 | 18 | 14 | 10 | 1 | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubles | 1 |
| width=130 bgcolor=dfe2e9 | Event | width=80 bgcolor=lime | W | width=85 bgcolor=thistle | F | width=85 bgcolor=ffff00 | SF | width=85 bgcolor=ffebcd | QF | width=85 bgcolor=afeeee | Round of 16 | width=85 bgcolor=afeeee | Round of 321 | width=85 | Q | width=85 | Q2 | width=85 | Q1 |
| Singles | $43,000 | $21,400 | $11,300 | $5,900 | $3,310 | $2,925 | $1,005 | $730 | $530 | ||||||||||
| Doubles2 | $12,300 | $6,400 | $3,435 | $1,820 | $960 |
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
 France | Kristina Mladenovic | 13 | 1 | |
 China | Zhang Shuai | 26 | 2 | |
 Belgium | Elise Mertens | 39 | 3 | |
 Czech Republic | Kristýna Plíšková | 41 | 4 | |
 Australia | Samantha Stosur | 44 | 5 | |
 Japan | Naomi Osaka | 45 | 6 | |
| Alison Riske | 49 | 7 | ||
 Kazakhstan | Yulia Putintseva | 50 | 8 |
The following players received wildcards into the singles main draw:
The following player received entry using a protected ranking:
The following players received entry from the qualifying draw:
Lauren Davis → replaced by 
Jana Čepelová Magdaléna Rybáriková → replaced by 
Sara Sorribes Tormo Kateřina Siniaková → replaced by Kurumi Nara
Natalia Vikhlyantseva → replaced by Richèl Hogenkamp Han Xinyun Markéta Vondroušová → replaced by 
Aliaksandra Sasnovich Zheng Saisai → replaced by Hsieh Su-wei| Country | Player | Country | Player | Rank1 | Seed | |
|---|---|---|---|---|---|---|
| Japan | Makoto Ninomiya | Czech Republic | Renata Voráčová | 70 | 1 | |
| Japan | Eri Hozumi | Japan | Miyu Kato | 78 | 2 | |
 Ukraine | Lyudmyla Kichenok | Katarina Srebotnik | 82 | 3 | ||
| Japan | Shuko Aoyama | China | Yang Zhaoxuan | 86 | 4 |
The following pairs received wildcards into the doubles main draw:
See main article: 2017 Japan Women's Open – Singles.
Zarina Diyas def. Miyu Kato, 6–2, 7–5[1]See main article: 2017 Japan Women's Open – Doubles.
Shuko Aoyama / Yang Zhaoxuan def. Monique Adamczak / Storm Sanders, 6–0, 2–6, [10–5]