The 2017 Rakuten Japan Open Tennis Championships was a men's tennis tournament played on outdoor hard courts.

It was the 44th edition of the Japan Open, and part of the 500 Series of the 2017 ATP World Tour.

It was held at the Ariake Coliseum in Tokyo, Japan, from October 2–8, 2017.

The following players received wildcards into the singles main draw: The following player received entry as a special exempt: The following players received entry from the qualifying draw: The following pairs received wildcards into the doubles main draw: The following pair received entry from the qualifying draw: