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| 2023 Keio Challenger | |
|---|---|
| Date | 20 – 26 November (men's) 27 November – 3 December (women's) |
| Edition | 16th (men's) 6th (women's) |
| Category | ATP Challenger Tour ITF Women's World Tennis Tour |
| Surface | Hard |
| Location | Yokohama, Japan |
| Champions | |
| Men's singles | |
 Yosuke Watanuki | |
| Women's singles | |
 Aliona Falei | |
| Men's doubles | |
 Filip Bergevi /  Mick Veldheer | |
| Women's doubles | |
 Liang En-shuo /  Tang Qianhui | |
The 2023 Keio Challenger was a professional tennis tournament played on hard courts. It was the 16th (men's) and 6th (women's) editions of the tournament and part of the 2023 ATP Challenger Tour and the 2023 ITF Women's World Tennis Tour. It took place in Yokohama, Japan between 20 November and 3 December 2023.
