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| Tournament details | |||
|---|---|---|---|
| Dates | 11–16 September | ||
| Level | Super 750 | ||
| Total prize money | US$700,000 | ||
| Venue | Musashino Forest Sport Plaza | ||
| Location | Tokyo, Japan | ||
| Champions | |||
| Men's singles |  Kento Momota | ||
| Women's singles |  Carolina Marín | ||
| Men's doubles |  Marcus Fernaldi Gideon Kevin Sanjaya Sukamuljo | ||
| Women's doubles | Yuki Fukushima Sayaka Hirota | ||
| Mixed doubles |  Zheng Siwei Huang Yaqiong | ||
| |||
The 2018 Japan Open (officially known as the Daihatsu Yonex Japan Open 2018 for sponsorship reasons) was a badminton tournament which took place at Musashino Forest Sport Plaza in Tokyo, Japan, from 11 to 16 September 2018 and had a total prize of $700,000.