| 2018 Japan Women's Open | |
|---|---|
| Date | September 10–16 |
| Edition | 10th |
| Category | WTA International |
| Draw | 32S / 16D |
| Prize money | $250,000 |
| Surface | Hard |
| Location | Hiroshima, Japan |
| Venue | Regional Park Tennis Stadium |
| Champions | |
| Singles | |
 Hsieh Su-wei | |
| Doubles | |
 Eri Hozumi /  Zhang Shuai | |
The 2018 Japan Women's Open was a women's tennis tournament played on outdoor hard courts. It was the tenth edition of the Japan Women's Open, and part of the WTA International tournaments of the 2018 WTA Tour. It was held at the Regional Park Tennis Stadium in Hiroshima, Japan, from September 10 through September 16, 2018. This is the first year that the tournament was held in Hiroshima.[1]