| 2013 Rakuten Japan Open Tennis Championships | |
|---|---|
| Date | 30 September – 6 October |
| Edition | 40th |
| Category | ATP World Tour 500 |
| Surface | Hard / outdoor |
| Location | Tokyo, Japan |
| Champions | |
| Singles | |
 Juan Martín del Potro | |
| Doubles | |
 Rohan Bopanna /  Édouard Roger-Vasselin | |
The 2013 Rakuten Japan Open Tennis Championships was a men's tennis tournament played on outdoor hard courts. It was the 40th edition of the event known this year as the Rakuten Japan Open Tennis Championships, and part of the 500 Series of the 2013 ATP World Tour. It was held at the Ariake Coliseum in Tokyo, Japan, from September 30 till October 6, 2013. First-seeded Juan Martín del Potro won the singles title.