| 2012 Rakuten Japan Open Tennis Championships | |
|---|---|
| Date | 1–7 October |
| Edition | 39th |
| Category | ATP World Tour 500 |
| Surface | Hard / outdoor |
| Location | Tokyo, Japan |
| Venue | Ariake Coliseum |
| Champions | |
| Singles | |
 Kei Nishikori | |
| Doubles | |
 Alexander Peya /  Bruno Soares | |
The 2012 Rakuten Japan Open Tennis Championships was a men's tennis tournament played on outdoor hard courts. It was the 39th edition of the event known this year as the Rakuten Japan Open Tennis Championships, and part of the 500 Series of the 2012 ATP World Tour. It was held at the Ariake Coliseum in Tokyo, Japan, from October 1 till October 7, 2012. Kei Nishikori won the singles title