| Orbis Scholae | ORBIS SCHOLAE | 1802-4637 |
| Orbis Terrarum | | 1385-285X |
| Orbis Tertius | | 1851-7811 |
| Orbit (Cambridge) | ORBIT (CAMBRIDGE) | 2398-6786 |
| Orbit | ORBIT-AN INTERNATIONAL JOURNAL ON ORBITAL DISORDERS AND FACIAL RECONSTRUCTIVE SURGERY | 0167-6830 |
| Orbital-The Electronic Journal of Chemistry | ORBITAL-THE ELECTRONIC JOURNAL OF CHEMISTRY | 1984-6428 |
| Ord Och Bild | | 0030-4492 |
| Order | ORDER | 0167-8094 |
| Ordines Militares Colloquia Torunensia Historica. Yearbook for the Study of the Military Orders | | 0867-2008 |
| Ore Geology Reviews | ORE GEOL REV | 0169-1368 |
| Oregon Historical Quarterly | OREGON HISTORICAL QUARTERLY | 0030-4727 |
| Organ Yearbook (the) | | 0920-3192 |
| Organic and Biomolecular Chemistry | ORG BIOMOL CHEM | 1477-0520 |
| Organic Agriculture | ORGANIC AGRICULTURE | 1879-4238 |
| Organic Chemistry Frontiers | ORGANIC CHEMISTRY FRONTIERS | 2052-4129 |
| Organic Communications | ORGANIC COMMUNICATIONS | 1307-6175 |
| Organic Electronics: physics, materials, applications | ORG ELECTRON | 1566-1199 |
| Organic Geochemistry | ORG GEOCHEM | 0146-6380 |
| Organic Letters | ORG LETT | 1523-7060 |
| Organic Preparations and Procedures International | ORG PREP PROCED INT | 0030-4948 |
| Organic Process Research & Development | ORG PROCESS RES DEV | 1083-6160 |
| Organic Syntheses | ORGANIC SYNTHESES | 0078-6209 |
| Organisation Management Journal | ORGANISATION MANAGEMENT JOURNAL | 1541-6518 |
| Organisational and Social Dynamics | ORGANISATIONAL AND SOCIAL DYNAMICS | 1474-2780 |
| Organisational Project Management | ORGANISATIONAL PROJECT MANAGEMENT | 2203-6156 |
| Organised Sound | | 1355-7718 |
| Organisms Diversity and Evolution | ORG DIVERS EVOL | 1439-6092 |
| Organizacija | ORGANIZACIJA | 1318-5454 |
| Organizacja i Kierowanie | | 0137-5466 |
| Organizacja i Zarządzanie : kwartalnik naukowy | | 1899-6116 |
| Organization | ORGANIZATION | 1350-5084 |
| Organization and Environment | ORGAN ENVIRON | 1086-0266 |
| Organization Development Journal | ORGANIZATION DEVELOPMENT JOURNAL | 0889-6402 |
| Organization Science | ORGAN SCI | 1047-7039 |
| Organization Studies | ORGAN STUD | 0170-8406 |
| Organization Technology and Management in Construction | ORGANIZATION TECHNOLOGY AND MANAGEMENT IN CONSTRUCTION | 1847-5450 |
| Organizational Behavior and Human Decision Processes | ORGAN BEHAV HUM DEC | 0749-5978 |
| Organizational Cultures | ORGANIZATIONAL CULTURES | 2327-8013 |
| Organizational Dynamics | ORGAN DYN | 0090-2616 |
| Organizational Psychology Review | ORGANIZATIONAL PSYCHOLOGY REVIEW | 2041-3866 |
| Organizational Research Methods | ORGAN RES METHODS | 1094-4281 |
| Organizations and Markets in Emerging Economies | ORGANIZATIONS AND MARKETS IN EMERGING ECONOMIES | 2029-4581 |
| Organizatsionnaya Psikologiya | ORGANIZATSIONNAYA PSIKOLOGIYA | 2312-5942 |
| Organogenesis | ORGANOGENESIS | 1547-6278 |
| Organometallic Chemistry | ORGANOMETALLIC CHEMISTRY | 0301-0074 |
| Organometallics | ORGANOMETALLICS | 0276-7333 |
| Organon | | 0078-6500 |
| Organon F | | 1335-0668 |
| Orgelkunst | | 0776-9350 |
| Oriens | ORIENS | 0078-6527 |
