| Journal of Obesity | JOURNAL OF OBESITY | 2090-0708 |
| Journal of Obesity & Metabolic Syndrome | JOURNAL OF OBESITY & METABOLIC SYNDROME | 2508-6235 |
| Journal of Object Technology | JOURNAL OF OBJECT TECHNOLOGY | 1660-1769 |
| Journal of Obsessive-Compulsive and Related Disorders | JOURNAL OF OBSESSIVE-COMPULSIVE AND RELATED DISORDERS | 2211-3649 |
| Journal of Obstetrics and Gynaecology | J OBSTET GYNAECOL | 0144-3615 |
| Journal of Obstetrics and Gynaecology Canada | JOURNAL OF OBSTETRICS AND GYNAECOLOGY CANADA | 1701-2163 |
| Journal of Obstetrics and Gynaecology Research | J OBSTET GYNAECOL RE | 1341-8076 |
| Journal of Obstetrics and Gynecology of India | JOURNAL OF OBSTETRICS AND GYNECOLOGY OF INDIA | 0971-9202 |
| Journal of Occupational and Environmental Hygiene | J OCCUP ENVIRON HYG | 1545-9624 |
| Journal of Occupational and Environmental Medicine | J OCCUP ENVIRON MED | 1076-2752 |
| Journal of Occupational and Organizational Psychology | J OCCUP ORGAN PSYCH | 0963-1798 |
| Journal of Occupational Health | J OCCUP HEALTH | 1341-9145 |
| Journal of Occupational Health Psychology | J OCCUP HEALTH PSYCH | 1076-8998 |
| Journal of Occupational Medicine and Toxicology | JOURNAL OF OCCUPATIONAL MEDICINE AND TOXICOLOGY | 1745-6673 |
| Journal of Occupational Rehabilitation | J OCCUP REHABIL | 1053-0487 |
| Journal of Occupational Science | JOURNAL OF OCCUPATIONAL SCIENCE | 1442-7591 |
| Journal of Occupational Therapy Schools and Early Intervention | JOURNAL OF OCCUPATIONAL THERAPY SCHOOLS AND EARLY INTERVENTION | 1941-1243 |
| Journal of Ocean and Coastal Economics | JOURNAL OF OCEAN AND COASTAL ECONOMICS | 2373-8456 |
| Journal of Ocean and Wind Energy | JOURNAL OF OCEAN AND WIND ENERGY | 2310-3604 |
| Journal of Ocean Engineering and Marine Energy | JOURNAL OF OCEAN ENGINEERING AND MARINE ENERGY | 2198-6444 |
| Journal of Ocean Engineering and Science | JOURNAL OF OCEAN ENGINEERING AND SCIENCE | 2468-0133 |
| Journal of Ocean Technology | JOURNAL OF OCEAN TECHNOLOGY | 1718-3200 |
| Journal of Ocean University of China | JOURNAL OF OCEAN UNIVERSITY OF CHINA | 1672-5182 |
| Journal of Oceanography | J OCEANOGR | 0916-8370 |
| Journal of Oceanology and Limnology | JOURNAL OF OCEANOLOGY AND LIMNOLOGY | 2096-5508 |
| Journal of Ocular Pharmacology and Therapeutics | J OCUL PHARMACOL TH | 1080-7683 |
| Journal of Offender Rehabilitation | JOURNAL OF OFFENDER REHABILITATION | 1050-9674 |
| Journal of Official Statistics | J OFF STAT | 0282-423X |
| Journal of Offshore Mechanics and Arctic Engineering | J OFFSHORE MECH ARCT | 0892-7219 |
| Journal of Oil Palm Research | J OIL PALM RES | 1511-2780 |
| Journal of Oleo Science | J OLEO SCI | 1345-8957 |
| Journal of Oman Studies | | 0378-8180 |
| Journal of Oncology | JOURNAL OF ONCOLOGY | 1687-8450 |
| Journal of Oncology Pharmacy Practice | JOURNAL OF ONCOLOGY PHARMACY PRACTICE | 1078-1552 |
| Journal of Oncology Practice | JOURNAL OF ONCOLOGY PRACTICE | 1554-7477 |
| Journal of Oncopathology | JOURNAL OF ONCOPATHOLOGY | 2052-5931 |
| Journal of Open Archaeology Data | JOURNAL OF OPEN ARCHAEOLOGY DATA | 2049-1565 |
| Journal of Open Innovation: Technology, Market, and Complexity | JOURNAL OF OPEN INNOVATION: TECHNOLOGY, MARKET, AND COMPLEXITY | 2199-8531 |
| Journal of Open Psychology Data | JOURNAL OF OPEN PSYCHOLOGY DATA | 2050-9863 |
| Journal of Open Research Software | JOURNAL OF OPEN RESEARCH SOFTWARE | 2049-9647 |
| Journal of Operation and Automation in Power Engineering | JOURNAL OF OPERATION AND AUTOMATION IN POWER ENGINEERING | 2322-4576 |
| Journal of Operational Meteorology | JOURNAL OF OPERATIONAL METEOROLOGY | 2325-6184 |
| Journal of Operational Oceanography | J OPER OCEANOGR | 1755-876X |
| Journal of Operational Risk | J OPER RISK | 1744-6740 |
| Journal of Operations and Supply Chain Management | JOURNAL OF OPERATIONS AND SUPPLY CHAIN MANAGEMENT | 1984-3046 |
| Journal of Operations Management | J OPER MANAG | 0272-6963 |
| Journal of Operator Theory | J OPERAT THEOR | 0379-4024 |
| Journal of Ophthalmic & Vision Research | JOURNAL OF OPHTHALMIC & VISION RESEARCH | 2008-2010 |
| Journal of Ophthalmic Inflammation and Infection | JOURNAL OF OPHTHALMIC INFLAMMATION AND INFECTION | 1869-5760 |
| Journal of Ophthalmology | JOURNAL OF OPHTHALMOLOGY | 2090-004X |
