| Occupational Health, Safety and Environmental Management Center |
1 |
| Occupational Health, Safety and Environmental Management Organization |
1 |
| Occupational Therapy |
1 2 |
| Office of Society-Academia Collaboration for Innovation |
1 |
| Ogata Wave Observatory |
1 |
| Open-Space Laboratories |
1 |
| Operation Theater |
1 2 |
| Operator Algebra |
1 2 |
| Optical Properties of Condensed Matter |
1 2 |
| Oral and Maxillofacial Surgery |
1 |
| Ordinary Differential Equations |
1 2 |
| Organ Preservation Technology |
1 |
| Organ Reconstruction |
1 2 |
| Organ Transplant Unit |
1 2 |
| Organic Chemistry |
1 2 3 4 5 6 7 8 9 |
| Organic Chemistry and Chemical Biology |
1 |
| Organic Chemistry in Life Science |
1 2 3 |
| Organic Chemistry of Life Science |
1 |
| Organic Chemistry of Molecular Assembly |
1 2 |
| Organic Material Chemistry |
1 2 3 |
| Organic Solid State Chemistry |
1 2 3 |
| Organic Synthesis |
1 |
| Organic System Design |
1 2 |
| Organization for the Promotion of International Relations |
1 |
| Organizational Emergency Management |
1 |
| Organoelement Chemistry |
1 2 |
| Organotransition Metal Chemistry |
1 |
| Oriental History |
1 2 |
| Oriental Studies, Department of |
1 |
| Orthopaedic and Musculoskeletal Surgery |
1 |
| Osaka Bioscience Institute |
1 |
| Osakayama Observatory |
1 |
| Otolaryngology, Head and Neck Surgery |
1 |
| Ouda Station |
1 |
| Outpatient Oncology Unit |
1 2 |
| Overseas Disaster Assistance and Emergency Relief in International Community |
1 |
