| 2017 Keio Challenger | |
|---|---|
| Date | 27 February – 5 March (ATP) 6 – 12 March (ITF) |
| Edition | 12th (ATP) 1st (ITF) |
| Category | ATP Challenger Tour ITF Women's Circuit |
| Prize money | $50,000+H (ATP) $25,000 (ITF) |
| Surface | Hard |
| Location | Yokohama, Japan |
| Champions | |
| Men's singles | |
 Yūichi Sugita | |
| Women's singles | |
| Akiko Omae | |
| Men's doubles | |
 Marin Draganja / Tomislav Draganja | |
| Women's doubles | |
| Ayaka Okuno / Erika Sema | |
The 2017 Keio Challenger was a professional tennis tournament played on hard courts. It was the twelfth (ATP) and first (ITF) editions of the tournament and part of the 2017 ATP Challenger Tour and the 2017 ITF Women's Circuit. The tournament offered $50,000+H in prize money for the men and $25,000 prize money for the women. It took place in Yokohama, Japan between 27 February and 5 March 2017 for the men's edition and between 6 and 12 March 2017 for the women's.