| 2018 Keio Challenger | |
|---|---|
| Date | 26 February – 4 March (ATP) 5 – 11 March (ITF) |
| Edition | 13th (ATP) 2nd (ITF) |
| Category | ATP Challenger Tour ITF Women's Circuit |
| Surface | Hard |
| Location | Yokohama, Japan |
| Champions | |
| Men's singles | |
 Yasutaka Uchiyama | |
| Women's singles | |
 Veronika Kudermetova | |
| Men's doubles | |
 Tobias Kamke / Tim Pütz | |
| Women's doubles | |
 Laura Robson /  Fanny Stollár | |
The 2018 Keio Challenger was a professional tennis tournament played on hard courts. It was the thirteenth (ATP) and second (ITF) editions of the tournament and part of the 2018 ATP Challenger Tour and the 2018 ITF Women's Circuit. It took place in Yokohama, Japan between 26 February and 4 March 2018 for the men's edition and between 5 and 11 March 2018 for the women's.
