- Oriental University (Russia)
- Oriental University Indore (India)
- Orissa University of Agriculture and Technology (India)
- Orkhon University (Mongolia)
- Osaka City University (Japan)
- Osaka College of Music (Japan)
- Osaka Dental University (Japan)
- Osaka Electro-Communication University (Japan)
- Osaka Gakuin University (Japan)
- Osaka Institute of Technology (Japan)
- Osaka International University (Japan)
- Osaka International University for Women (Japan)
- Osaka Medical College (Japan)
- Osaka Prefectural University (Japan)
- Osaka Sangyo University (Japan)
- Osaka Shoin Women's College (Japan)
- Osaka University (Japan)
- Osaka University of Arts (Japan)
- Osaka University of Commerce (Japan)
- Osaka University of Economics (Japan)
- Osaka University of Economics & Law (Japan)
- Osaka University of Education (Japan)
- Osaka University of Foreign Studies (Japan)
- Osaka University of Health and Sport Sciences (Japan)
- Osaka University of Pharmaceutical Sciences (Japan)
- Osaka Women's University (Japan)
- OSCE Academy in Bishkek (Kyrgyzstan)
- Oslo National Academy of Fine Arts (Norway)
- Oslo School of Architecture (Norway)
- Osmangazi University (Turkey)
- Osmania University, Hyderabad (India)
- Ostbayerische Technische Hochschule Regensburg (Germany)
- Ostfalia Hochschule für angewandte Wissenschaften (Germany)
- Osun State University (Nigeria)
- Otani University (Japan)
- Otaru University of Commerce (Japan)
- Otemae University (Japan)
- Otemon Gakuin University (Japan)
- Otsuma Women's University (Japan)
- Otto-Friedrich Universität Bamberg (Germany)
- Otto-von-Guericke Universität Magdeburg (Germany)
- Oulu Polytechnic (Finland)
- Our Lady of Fatima University (Philippines)
- Oxford Brookes University (United Kingdom)
- Ozyegin University (Turkey)
- Pabna University of Science and Technology (Bangladesh)
- Pacific Adventist University (Papua New Guinea)
- Pacific International College (Canada)
- Pädagogische Hochschule Freiburg (Germany)
- Pädagogische Hochschule Heidelberg (Germany)