Keio University has a long tradition of comprehensive primary and secondary education. Elementary, junior, and senior high school affiliates have been part of Keio operations for more than half a century. Students are encouraged to be self-starters in all aspects, and are offered a multitude of age-appropriate opportunities to develop their individual abilities. While the educational philosophy remains largely the same, each school possesses a unique personality and its own set of policies, which set the course of fostering both diversity and competence among the students.
- Keio Futsubu School (Boys Junior High School)
- Keio Chutobu Junior High School
- Keio Shonan Fujisawa Junior and Senior High School
- Keio Senior High School
- Keio Shiki Senior High School
- Keio Girls Senior High School
- Keio Academy of New York (High School)