The 2024 Keio Challenger was a professional tennis tournament played on hard courts.

It was the 17th (men's) and 7th (women's) editions of the tournament and part of the 2024 ATP Challenger Tour and the 2024 ITF Women's World Tennis Tour.

It took place in Yokohama, Japan between 18 November and 1 December 2024.

The following players received wildcards into the singles main draw: The following players received entry from the qualifying draw: The following players received wildcards into the singles main draw: The following player received entry into the singles main draw using a special ranking: The following players received entry from the qualifying draw: