- Oita University of Nursing and Health Sciences
- Okayama Prefectural University
- Okayama Shoka University
- Okayama University
- Okayama University of Science
- Okinawa Institute of Science and Technology Graduate University (OIST)
- Okinawa International University
- Okinawa Prefectural University of Fine Arts
- Okinawa University
- Osaka City University
- Osaka College of Music
- Osaka Dental University
- Osaka Electro-Communication University
- Osaka Gakuin University
- Osaka Institute of Technology
- Osaka International University
- Osaka International University for Women
- Osaka Medical College
- Osaka Prefectural University
- Osaka Sangyo University
- Osaka Shoin Women's College
- Osaka University
- Osaka University of Arts
- Osaka University of Commerce
- Osaka University of Economics
- Osaka University of Economics & Law
- Osaka University of Education
- Osaka University of Foreign Studies
- Osaka University of Health and Sport Sciences
- Osaka University of Pharmaceutical Sciences
- Osaka Women's University
- Otani University
- Otaru University of Commerce
- Otemae University
- Otemon Gakuin University
- Otsuma Women's University
- Polytechnic University
- Poole Gakuin University
- Rakuno Gakuen University
- Reitaku University
- Rikkyo University (St. Paul's University)
- Rissho University
- Ritsumeikan Asia Pacific University
- Ritsumeikan University
- Ryukoku University
- Ryutsu Keizai University
- Saga Medical School
- Sagami Women's University
- Saga University
- Saitama Institute of Technology