| Journal Name | Publisher Name | Country | Articles Count |
| OA Alcohol | Open Access Publishing London | United Kingdom | 29 |
| OA Alternative Medicine | Open Access Publishing London | United Kingdom | 12 |
| OA Anaesthetics | Open Access Publishing London | United Kingdom | 19 |
| OA Anatomy | Open Access Publishing London | United Kingdom | 57 |
| OA Arthritis | Open Access Publishing London | United Kingdom | 24 |
| OA Autism | Open Access Publishing London | United Kingdom | 36 |
| OA Behavioural Medicine | Open Access Publishing London | United Kingdom | 7 |
| OA Biochemistry | Open Access Publishing London | United Kingdom | 20 |
| OA Bioinformatics | Open Access Publishing London | United Kingdom | 6 |
| OA Biology | Open Access Publishing London | United Kingdom | 3 |
| OA Biotechnology | Open Access Publishing London | United Kingdom | 18 |
| OA Cancer | Open Access Publishing London | United Kingdom | 18 |
| OA Case Reports | Open Access Publishing London | United Kingdom | 130 |
| OA Critical Care | Open Access Publishing London | United Kingdom | 10 |
| OA Dentistry | Open Access Publishing London | United Kingdom | 14 |
| OA Dermatology | Open Access Publishing London | United Kingdom | 3 |
| OA Drug Design and Delivery | Open Access Publishing London | United Kingdom | 7 |
| OA Emergency Medicine | Open Access Publishing London | United Kingdom | 6 |
| OA Epidemiology | Open Access Publishing London | United Kingdom | 8 |
| OA Evidence-Based Medicine | Open Access Publishing London | United Kingdom | 8 |
| OA Family Medicine | Open Access Publishing London | United Kingdom | 7 |
| OA Genetics | Open Access Publishing London | United Kingdom | 11 |
| OA Hepatology | Open Access Publishing London | United Kingdom | 7 |
| OA Immunology | Open Access Publishing London | United Kingdom | 10 |
| OA Inflammation | Open Access Publishing London | United Kingdom | 6 |
| OA Medical Hypothesis | Open Access Publishing London | United Kingdom | 16 |
| OA Microbiology | Open Access Publishing London | United Kingdom | 3 |
| OA Minimally Invasive Surgery | Open Access Publishing London | United Kingdom | 2 |
| OA Molecular and Cell Biology | Open Access Publishing London | United Kingdom | 2 |
| OA Molecular Oncology | Open Access Publishing London | United Kingdom | 8 |
| OA Musculoskeletal Medicine | Open Access Publishing London | United Kingdom | 37 |
| OA Nephrology | Open Access Publishing London | United Kingdom | 13 |
| OA Neurosciences | Open Access Publishing London | United Kingdom | 3 |
| OA Orthopaedics | Open Access Publishing London | United Kingdom | 34 |
| OA Otolaryngology | Open Access Publishing London | United Kingdom | 1 |
| OA Robotic Surgery | Open Access Publishing London | United Kingdom | 12 |
| OA Sports Medicine | Open Access Publishing London | United Kingdom | 2 |
| OA Stem Cells | Open Access Publishing London | United Kingdom | 8 |
| OA Surgery | Open Access Publishing London | United Kingdom | 2 |
| OA Tissue Engineering | Open Access Publishing London | United Kingdom | 7 |
| OA Women's Health | Open Access Publishing London | United Kingdom | 15 |
| OAH Newsletter | Organization of American Historians | United States | 284 |
| Oak Ridge National Laboratory Review | Oak Ridge National Laboratory | United States | 811 |
| OALib Journal | OALib | Iceland | 162 |
| OAtube Nanotechnology | Open Access House of Science and Technology | United States | 10 |
| Obesity and Control Therapies | Symbiosis Group | United States | 6 |
| Obesity Facts | Karger Publisher | Switzerland | 483 |
| Obesity Research | Openventio Publishers | United States | 1 |
| Obras y Proyectos | Universidad Católica de la Santísima Concepción | Chile | 68 |
| Observar | University of Barcelona | Spain | 51 |
| Observatorio | OberCom - Observatorio da Comunicação | Spain | 295 |
| Observatorio Laboral Revista Venezolana | Universidad de Carabobo | Venezuala | 23 |
| Observatorio Medioambiental | Universidad Complutense de Madrid | Spain | 135 |
| Obstetrician and Gynaecologist | John Wiley and Sons, Inc | United States | 882 |
| Obstetrics and Gynaecology Cases – Reviews | ClinMed International Library | United States | 6 |
| Obstetrics and Gynecology | IBIMA Publishing | United States | 4 |
| Obstetrics and Gynecology International | Hindawi Publishing Corporation | United States | 315 |
| Obstetrics and Gynecology International Journal | MedCrave Group | United States | 10 |
| Obstetrics and Gynecology Science | Korean Society of Obstetrics and Gynecology | Korea, Republic of | 197 |
| OC Metro Business | Churm Media | United States | 2510 |
| Occasion | Stanford University | United States | 75 |
| Occasional Papers in Sociology and Anthropology | Tribhuvan University | Nepal | 99 |
| Occupational Diseases and Environmental Medicine | Scientific Research Publishing, Inc | United States | 14 |
| Occupational Health and Safety Magazine | 1105 Media Inc | United States | 5668 |
| Occupational Medicine | Oxford University Press | United Kingdom | 3059 |
| Occupational Medicine and Health Affairs | OMICS Publishing Group | United States | 29 |
| Occupational Outlook Quarterly | US Departmnet of Labour | United States | 344 |
| Ocean Acidification | Walter de Gruyter GmbH & Co. KG | Germany | 1 |
| Ocean and Environmental Fluid Research | ORIC Publications | United States | 6 |
| Ocean and Polar Research | Korean Institute of Ocean Science and Technology | Korea, Republic of | 41 |
| Ocean Science | Copernicus GmbH (Copernicus Publications) | Germany | 433 |
| Ocean Science Discussions | Copernicus GmbH (Copernicus Publications) | Germany | 1022 |
| Oceanography | OMICS Publishing Group | United States | 42 |
| Oceanography | Oceanography Society | United States | 726 |
| Oceanologia | Institute of Oceanology Polish Academy of Sciences | Poland | 524 |
| Oceanus | Oceanus | United States | 575 |
| Ochsner Journal | Ochsner Journal | United States | 583 |
| Octa Journal of Biosciences | Scientific Planet Society | India | 43 |
| Octa Journal of Environmental Research | Scientific Planet Society | India | 68 |
| Oeconomia | Wydawnictwo SGGW w Warszawie | Poland | 76 |
| Oeconomics of Knowledge | Saphira Publishing House | Romania | 66 |
| OEM Off-Highway | Cygnus Business Media | United States | 810 |
| OfficePro | International Association of Administrative Professionals | United States | 33 |
| Offshore Engineer | Atlantic Communications | United States | 2032 |
| Ofogh-e-Danesh Journal | Gonabad University of Medical Sciences and Health Services | Iran | 162 |
| OGIRISI | African Journals OnLine | South Africa | 47 |
| Ohio Journal of Science | Ohio Academy of Science | United States | 13 |
| Ohio State Law Journal | Ohio State law journal | United States | 480 |
| Oil and Gas Business | Ufa State Petroleum Technological University | Russian Federation | 1124 |
| Oil and Gas Science and Technology | IFP | France | 727 |
| OJAS: Expanding the Knowledge Horizon | Jaipuria Institute of Management Studies | India | 22 |
| Okajimas Folia Anatomica Japonica | Editorial Board of Okajimas Folia Anatomica Japonica | Japan | 249 |
| Oklahoma Bar Journal | Oklahoma Bar Association | United States | 3340 |
| Oklahoma Law Review | University of Oklahoma Law Center | United States | 206 |
| Oklahoma Native Plant Record | Oklahoma Native Plant Society | United States | 26 |
| OLA Quarterly | Oregon Library Association | United States | 49 |
| Olsztyn Economic Journal | Versita | Poland | 137 |
| Oman Journal of Ophthalmology | Medknow Publications Pvt Ltd | India | 374 |
| Oman Medical Journal | Oman Medical Specialty Board | Saudi Arabia | 610 |
| OMICS Journal of Radiology | OMICS Publishing Group | United States | 105 |
| On Common Ground | National Association of Realtors | United States | 323 |
| On Our Terms: The Undergraduate Journal of the Athena Center for Leadership Studies | Columbia University | United States | 4 |
| On Wall Street | On Wall Street | United States | 292 |
| Onco Reviews | Vedic Research International | United States | 2 |
| Oncocytology Journal | Edorium Journals | India | 1 |
| Oncogenesis | Nature Publishing Group | United Kingdom | 101 |
| OncoImmunology | European Academy of Tumor Immunology | United States | 946 |
| Oncología | Alpe Editores, S.A. | Spain | 96 |
| Oncologist | AlphaMed Press | United States | 2010 |
| Oncology | United Business Media company | Australia | 248 |
| Oncology Discovery | Herbert Publications | United Kingdom | 3 |
| Oncology Letters | Spandidos Publications Ltd | Greece | 1137 |
| Oncology Reviews | PAGEPress | Italy | 139 |
| Oncology, Gastroenterology and Hepatology Reports | Medknow Publications Pvt Ltd | India | 73 |
| Oncolytic Virotherapy | Dove Medical Press Ltd | United Kingdom | 9 |
| OncomiRs | Walter de Gruyter GmbH & Co. KG | Germany | 1 |
| Oncotarget | Impact Journals | United States | 2701 |
| OncoTargets and Therapy | Dove Medical Press Ltd | United Kingdom | 668 |
| Onderstepoort Journal of Veterinary Research | AOSIS OpenJournals | South Africa | 341 |
| One Country | Bahá'í International Community | United States | 308 |
| OnEarth | Natural Resources Defense Council | United States | 615 |
| Online - Heidelberg Journal of Religions on the Internet | Universität Heidelberg | Germany | 36 |
| Online Brazilian Journal of Nursing | Online Brazilian Journal of Nursing | Brazil | 759 |
| Online International Interdisciplinary Research Journal | Online International Interdisciplinary Research Journal | India | 720 |
| Online International Journal of Arts and Humanities | Online Research Journals | United States | 61 |
| Online International Journal of Engineering and Technology Research | Online Research Journals | United States | 3 |
| Online International Journal of Food Science | Online Research Journals | United States | 6 |
| Online International Journal of Medicinal Plants Research | Online Research Journals | United States | 10 |
| Online International Journal of Microbiology Research | Online Research Journals | United States | 7 |
| Online Journal of African Affairs | Online Research Journals | United States | 29 |
| Online Journal of Analytic Combinatorics | University of Auckland | New Zealand | 8 |
| Online Journal of Animal and Feed Research | Science-Line Publication | Turkey | 219 |
| Online Journal of Applied Knowledge Management | International Institute for Applied Knowledge Management | Poland | 58 |
| Online Journal of Art and Design | Eastern Mediterranean University | Turkey | 33 |
| Online Journal of Biological Sciences | Science Publications | United States | 132 |
| Online Journal of Communication and Media Technologies | Online Journal of Communication and Media Technologies | Turkey | 146 |
| Online Journal of Counselling and Education | Online Journal of Counselling and Education | Turkey | 31 |
| Online Journal of Distance Learning Administration | State University of West Georgia | United States | 332 |
| Online Journal of Earth Sciences | Medwell Online | Pakistan | 83 |
| Online Journal of Education Research | Online Research Journals | United States | 21 |
| Online Journal of Ethics | University of St Thomas | United States | 22 |
| Online Journal of Health and Allied Sciences | Online Journal for Health and Allied Sciences | India | 523 |
| Online Journal of Health Ethics | University of Mississippi Medical Center | United States | 88 |
| Online Journal of International Case Analysis | Florida International University | United States | 36 |
| Online Journal of Issues in Nursing | Kent State University | United States | 223 |
| Online Journal of Medicine and Medical Science Research | Online Research Journals | United States | 28 |
| Online Journal of New Horizons in Education | Online Journal of New Horizons in Education | Turkey | 134 |
| Online Journal of Nursing Informatics | Online Journal of Nursing Information | United States | 212 |
| Online Journal of Peace and Conflict Resolution | Tabula Rasa Institute | United States | 19 |
| Online Journal of Physical and Environmental Science Research | Online Research Journals | United States | 4 |
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МЫ ЯВЛЯЕМСЯ ОФИЦИАЛЬНЫМ ПРЕДСТАВИТЕЛЕМ И ДИСТРИБУТОРОМ
