| Otorhinolaryngologist | OTORHINOLARYNGOLOGIST | 1752-9360 |
| Otorhinolaryngology Clinics | OTORHINOLARYNGOLOGY CLINICS | 0975-444X |
| Otorinolaringologia | OTORINOLARINGOLOGIA | 0392-6621 |
| Otoritas-Jurnal Ilmu Pemerintahan | OTORITAS-JURNAL ILMU PEMERINTAHAN | 2088-3706 |
| Otorynolaryngologia - Przegląd Kliniczny | | 1643-658X |
| Otorynolaryngologia-przeglad Kliniczny | | |
| Ottagono: Rivista Trimestrale di Architettura, Arredamento E Industrial Design | | 0391-7487 |
| Otto-novecento | | 0391-2639 |
| Oud Holland | | 0030-672X |
| Outlook on Agriculture | OUTLOOK AGR | 0030-7270 |
| Outlooks on Pest Management | OUTLOOKS ON PEST MANAGEMENT | 1743-1026 |
| Outre-Mers | | 1631-0438 |
| Over Multatuli | | 0166-2058 |
| Overijsselse Historische Bijdragen | | 0165-6465 |
| Overland | OVERLAND | 0030-7416 |
| Ovidius University Annals of Chemistry | OVIDIUS UNIVERSITY ANNALS OF CHEMISTRY | 1583-2430 |
| Oxford Art Journal | | 0142-6540 |
| Oxford Bulletin of Economics and Statistics | OXFORD B ECON STAT | 0305-9049 |
| Oxford Development Studies | OXFORD DEVELOPMENT STUDIES | 1360-0818 |
| Oxford Economic Papers | OXFORD ECON PAP | 0030-7653 |
| Oxford German Studies | | 0078-7191 |
| Oxford Journal of Archaeology | | 0262-5253 |
| Oxford Journal of Law and Religion | OXFORD JOURNAL OF LAW AND RELIGION | 2047-0770 |
| Oxford Journal of Legal Studies | OXFORD J LEGAL STUD | 0143-6503 |
| Oxford Literary Review | | 0305-1498 |
| Oxford Medical Case Reports | OXFORD MEDICAL CASE REPORTS | 2053-8855 |
| Oxford Review of Economic Policy | OXFORD REV ECON POL | 0266-903X |
| Oxford Review of Education | OXFORD REV EDUC | 0305-4985 |
| Oxford Studies in Ancient Philosophy | | 0265-7651 |
| Oxford Studies in Comparative Education | | 0961-2149 |
| Oxford University Commonwealth Law Journal | OXFORD UNIVERSITY COMMONWEALTH LAW JOURNAL | 1472-9342 |
| Oxidation Communications | OXID COMMUN | 0209-4541 |
| Oxidation of Metals | OXID MET | 0030-770X |
| Oxidative Medicine and Cellular Longevity | OXID MED CELL LONGEV | 1942-0900 |
| Oxoniensia | | 0308-5562 |
| Oxymag | OXYMAG | 0990-1310 |
| Ozone: Science and Engineering | OZONE-SCI ENG | 0191-9512 |
| P and T | P AND T | 1052-1372 |
| P-Adic Numbers Ultrametric Analysis and Applications | P-ADIC NUMBERS ULTRAMETRIC ANALYSIS AND APPLICATIONS | 2070-0466 |
| PAAKAT-Revista de Tecnología y Sociedad | PAAKAT-REVISTA DE TECNOLOGÍA Y SOCIEDAD | 2007-3607 |
| PACE - Pacing and Clinical Electrophysiology | PACE | 0147-8389 |
| Pachyderm | PACHYDERM | 1026-2881 |
| Pacific Accounting Review | PACIFIC ACCOUNTING REVIEW | 0114-0582 |
| Pacific Affairs | PAC AFF | 0030-851X |
| Pacific Asia Journal of the Association for Information Systems | PACIFIC ASIA JOURNAL OF THE ASSOCIATION FOR INFORMATION SYSTEMS | 1943-7536 |
| Pacific Business Review International | PACIFIC BUSINESS REVIEW INTERNATIONAL | 0974-438X |
| Pacific Coast Philology | PACIFIC COAST PHILOLOGY | 0078-7469 |
| Pacific Conservation Biology | PACIFIC CONSERVATION BIOLOGY | 1038-2097 |
| Pacific Economic Bulletin | PAC ECON BULL | 0817-8038 |
| Pacific Economic Review | PAC ECON REV | 1361-374X |
