| Obesity Medicine | Elsevier |
| Obesity Research & Clinical Practice | Elsevier |
| Obstetrics, Gynaecology & Reproductive Medicine | Elsevier |
| Ocean & Coastal Management | Elsevier |
| Ocean Engineering | Elsevier |
| Omega | Elsevier |
| Online Social Networks and Media | Elsevier |
| Operations Research for Health Care | Elsevier |
| Operations Research Letters | Elsevier |
| Operative Techniques in General Surgery | Elsevier |
| Operative Techniques in Neurosurgery | Elsevier |
| Operative Techniques in Orthopaedics | Elsevier |
| Operative Techniques in Otolaryngology-Head and Neck Surgery | Elsevier |
| Operative Techniques in Plastic and Reconstructive Surgery | Elsevier |
| Operative Techniques in Sports Medicine | Elsevier |
| Operative Techniques in Thoracic and Cardiovascular Surgery | Elsevier |
| Opportunistic Pathogens | Elsevier |
| Optical Fiber Technology | Elsevier |
| Optical Materials | Elsevier |
| Optical Switching and Networking | Elsevier |
| Optics & Laser Technology | Elsevier |
| Optics and Lasers in Engineering | Elsevier |
| Optics Communications | Elsevier |
| Optik | Elsevier |
| Option/Bio | Elsevier |
| Opto-Electronics Review | Elsevier |
| Optometry - Journal of the American Optometric Association | Elsevier |
| Oral Oncology | Elsevier |
| Oral Oncology Supplement | Elsevier |
| Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology | Elsevier |
| Orbis | Elsevier |
| Organic Electronics | Elsevier |
| Organic Geochemistry | Elsevier |
| Organizational Behavior and Human Decision Processes | Elsevier |
| Organizational Dynamics | Elsevier |
| Orthodontic Waves | Elsevier |
| Orthopaedics & Traumatology: Surgery & Research | Elsevier |
| Orthopaedics and Trauma | Elsevier |
| Osteoarthritis and Cartilage | Elsevier |
| Osteopathische Medizin | Elsevier |
| Obere Extremität | Springer |
| Obesity Surgery | Springer |
| Occupational Health Science | Springer |
| Ocean Dynamics | Springer |
| Ocean Science Journal | Springer |
| Oceanology | Springer |
| Odontology | Springer |
| Oecologia | Springer |
| Open Economies Review | Springer |
| Operational Research | Springer |
| Operations Management Research | Springer |
| Operative Orthopädie und Traumatologie | Springer |
| OPSEARCH | Springer |
| Optical and Quantum Electronics | Springer |
| Optical Memory and Neural Networks | Springer |
| Optical Review | Springer |
| Optics and Spectroscopy | Springer |
| Optimization and Engineering | Springer |
| Optimization Letters | Springer |
| Optoelectronics Letters | Springer |
| Optoelectronics, Instrumentation and Data Processing | Springer |
| OR Spectrum | Springer |
| Oral and Maxillofacial Surgery | Springer |
| Oral Cancer | Springer |
| Oral Radiology | Springer |
| Order | Springer |
| Organic Agriculture | Springer |
| Organisationsberatung, Supervision, Coaching | Springer |
| Organisms Diversity & Evolution | Springer |
| Oriental Pharmacy and Experimental Medicine | Springer |
| Origins of Life and Evolution of Biospheres | Springer |
| Orthopädie & Rheuma | Springer |
| Osteoporosis International | Springer |
| Österreichische Wasser- und Abfallwirtschaft | Springer |
| Österreichische Zeitschrift für Soziologie | Springer |
| Oxidation of Metals | Springer |
| OBESITY | Wiley |
| OBESITY REVIEWS | Wiley |
| OCEANIA | Wiley |
| OIKOS | Wiley |
| OIL AND ENERGY TRENDS | Wiley |
| OIL AND ENERGY TRENDS: ANNUAL STATISTICAL REVIEW | Wiley |
| OPEC ENERGY REVIEW | Wiley |
| OPHTHALMIC AND PHYSIOLOGICAL OPTICS | Wiley |
| OPTIMAL CONTROL APPLICATIONS AND METHODS | Wiley |
| ORAL DISEASES | Wiley |
| ORAL SURGERY | Wiley |
| ORBIS LITTERARUM | Wiley |
| ORTHODONTICS & CRANIOFACIAL RESEARCH | Wiley |
| OXFORD BULLETIN OF ECONOMICS & STATISTICS | Wiley |
| OXFORD JOURNAL OF ARCHAEOLOGY | Wiley |