| Titulo | Fecha | Proveedor | Acceso | Cambio de titulo |
| O A R: The Oxford Artistic and Practice Based Research Platform | 2016- | OAR | . | . |
| O Biológico | 2000- | Instituto Biologico Sao Paolo | . | . |
| O eixo e a roda Revista de literatura brasileira | 1982- | Universidade Federal de Minas Gerais | . | . |
| O Manguezal revista de filosofia | 2017- | Universidade Federal de Sergipe | . | . |
| O Marrare | . | Universidade do Estado do Rio de Janeiro | . | . |
| O Mundo da Saúde | 2006- | Centro Universitário São Camilo | . | . |
| O observatório mídia & política | 2011- | Universidade de Brasília | . | . |
| O Pedreiro Livre | 2013- | Grupo Verde de Agroecologia e Abelhas | . | . |
| O público e o privado | 2002- | Universidade Estadual do Ceará | . | . |
| O que nos faz pensar? | 1989- | Pontifícia Universidade Católica do Rio de Janeiro | . | . |
| O S U naturalist Ohio State University Biological Club | 1900-1906 | Hathitrust | . | . |
| O social em questão Revista do Departamento de Serviço Social | 2007- | Pontifícia Universidade Católica do Rio de Janeiro | . | . |
| O Teatro Transcende | 2011- | Universidade Regional de Blumenau | . | . |
| O&G Open | 2024- | Wolters Kluwer | . | . |
| O'San Trocado Anuario dedicado al Trino San Torcuato | 1963 | Galiciana | . | . |
| o-bib. Das offene Bibliotheksjournal | 2014- | Verein Deutscher Bibliothekarinnen und Bibliothekare (VDB) | . | . |
| O.S.U. naturalist | 1900-1903 | BioDiversity Heritage Library | . | . |
| OADI Rivista dell'Osservatorio per le Arti Decorative in Italia | 2010- | Università degli Studi di Palermo | . | . |
| OASE Journal for Architecture | 1981- | NAi Publishers | . | . |
| OASIcs OpenAccess Series in Informatics | 2006- | Schloss Dagstuhl -- Leibniz-Zentrum fuer Informatik | . | . |
| OASIS Observatorio de Análisis de los Sistemas Internacionales | 2005- | Red ALyC | . | . |
| OASIS Observatorio de Análisis de los Sistemas Internacionales | 1995- | Universidad Externado de Colombia | . | . |
| Oasis Revue du Centre International d´Éudes et de Recherches Oasis | 2005- | Fondazione Cassamarca | . | . |
| OAtube Nanotechnology | 2007-2009 | Wayback Machine | . | . |
| Obesities | 2021- | MDPI AG | . | . |
| Obesity | 2006- excepto últimos 12 meses | Wiley Online Library | . | Cambio de: Obesity Research |
| Obesity and Endocrinology | 2025- | Oxford Academic | . | . |
| Obesity Facts | 2008- | PubMed Central | . | . |
| Obesity Facts | 2008- | Karger Publishers | . | . |
| Obesity Pillars | 2022- | Elsevier Science | . | . |
| Obesity Pillars | 2022- | PubMed Central | . | . |
| Obesity research | 1993-2005 | Wiley Online Library | . | Cambio a: Obesity |
| Obesity Science & Practice | 2015- | Wiley Online Library | . | . |
| Obesity Science & Practice | 2015- | PubMed Central | . | . |
| OBG Management | 2000- | Dowden Health Media | . | . |
| OBIHIRO OTANI JUNIOR COLLEGE Center for Regional collaboration | 2016- | J-STAGE, Japan Science and Technology Information Aggregator, Electronic | . | . |
| Obiter | 2020- | SciELO (South Africa) | . | . |
| OBM Genetics | 2017- | LIDSEN Publishing Inc. | . | . |
| OBM Geriatrics | 2017- | LIDSEN Publishing Inc. | . | . |
| OBM Hepatology and Gastroenterology | 2017- | LIDSEN Publishing Inc. | . | . |
| OBM Integrative and Complementary Medicine | 2016- | LIDSEN Publishing Inc | . | . |
| OBM Neurobiology | 2017- | LIDSEN Publishing Inc. | . | . |
| OBM Transplantation | 2017- | LIDSEN Publishing Inc. | . | . |
| OBOE | 2020- | OBOE On Biennials and Other Exhibitions Associazione Culturale | . | . |
| Obozrenie Psihiatrii i Medicinskoj Psihologii imeni VM Behtereva | 2016- | Federal State Budget Scientific Institution National Medical Research Center for Psychiatry and Neurology n.a. V.M. Bekhterev Ministry of Health of the Russian Federation | . | . |
| Obra digital: revista de comunicación | 2011- | RACO | . | . |
| Obra digital: revista de comunicación | 2011- | Universitat de Vic | . | . |
| Obrana a Strategie | 2001- | University of Defence | . | . |
| Obrana a Strategie | 2007- | CEEOL | . | . |
| Obras | 1999- | Expansion | . | . |
| Obras malacologicas | 1890-1907 | BioDiversity Heritage Library | . | . |
| Obras y Proyectos | 2011- | SciELO (Chile) | . | . |
| Obrazovanie i Nauka | 2012- | . | . | . |
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| Obrero El órgano de la Agrupación Socialista Ferrolana y defensor de la clase trabajadora | 1932-1936 | Galiciana | . | . |
| Observar | 2007- | RACO | . | . |
| Observational Studies | 2005- | Project Muse | . | . |
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| Observations astronomiques faites à l'Observatoire impérial de Paris | 1803-1846 | Gallica. Bibliothèque Nationale Paris | . | . |
| Observations faites sur les cours d'eau et les pluies centralisées pendant l'année Service hydrométrique du bassin de la Seine | 1872-1874 | Gallica. Bibliothèque Nationale Paris | . | . |
| Observations magnétiques magnetic results | 1996- | Bureau Central de Magnétisme Terrestre | . | . |
| Observations périodiques sur la physique l'histoire naturelle et les arts ou Journal des sciences et arts | 1756-1757 | Gallica. Bibliothèque Nationale Paris | . | . |
| Observations sur l'histoire naturelle sur la physique et sur la peinture | 1752-1755 | BioDiversity Heritage Library | . | . |
| Observations sur l'histoire naturelle, sur la physique et sur la peinture | 1752-1755 | BioDiversity Heritage Library | . | . |
| Observations sur la physique sur l'histoire naturelle et sur les arts | 1773-1793 | Gallica. Bibliothèque Nationale Paris | . | . |
| Observatoire de la société britannique | 2006- excepto últimos 12 meses | Open Edition | . | . |
| Observatorio da imprensa | . | Projor | . | . |
| Observatório da Jurisdição Constitucional | 2008- | Instituto Brasiliense de Direito Público | . | . |
| Observatório da Religião | 2014-2017 | Universidade do Estado do Pará | . | . |
| Observatorio de la Economia y la Sociedad China | 2007-2011 | El Grupo de Investigacion Eumed.net | . | . |
| Observatorio Iberoamericano de la Economía y la Sociedad del Japón | 2009- | Universidad de Málaga | . | . |
| Observatorio Iberoamericano del Desarrollo Local y la Economia Social | 2007- | El Grupo de Investigacion Eumed.net | . | . |
| Observatorio Laboral Revista Venezolana | 2008- | Universidad de Carabobo | . | . |
| Observatorio Laboral Revista Venezolana | 2008- | Dialnet | . | . |
| Observatorio Laboral Revista Venezolana | 2008-2015 | Red ALyC | . | . |
| Observatorio Medioambiental | 1998- excepto últimos 12 meses | Universidad Complutense de Madrid | . | . |
| Observatorio OBS* | 2007- | OberCom - Observatorio da Comunicação | . | . |
| Observatorio OBS* | 2011-2011 | SciELO (Portugal) | . | . |
| Observatorio Social de América Latina OSAL | 2000-2008 | CLACSO - Consejo Latinoamericano de Ciencias Sociales | . | . |
| Observatorium Revista Electronica de Geografia | 2009- | Universidade Federal de Uberlândia | . | . |
| Observatory | 1877- | NASA Astrophysics Data System | . | . |
| Observer and record of agriculture Science and art | 1838-1839 | BioDiversity Heritage Library | . | . |
| Observer London England | 1998- | Guardian Newspapers Limited | . | . |
| Obsidiana Ciencia y Cultura por Mexico | . | Editorial Emergente | . | . |
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| Obstetrician & Gynaecologist | 1999- excepto últimos 24 meses | Wiley Online Library | . | . |
| Obstetrics & Gynecology Science | 2013- | PubMed Central | . | Cambio de: Korean Journal of Obstetrics & Gynecology |
| Obstetrics & Gynecology Science | 2013- | KoreaMed | . | Cambio de: Korean Journal of Obstetrics & Gynecology |
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| Obstetrics and Gynecology International | 2009- | PubMed Central | . | . |
| Obstetrics, Gynecology and Reproduction | 2007- | Elpub.ru | . | . |
| Obutchénie | 2017- | Universidade Federal de Uberlândia | . | . |
| Obzornik zdravstvene nege | 2014- | Nurses and Midwives Association of Slovenia | . | . |
| Occasion Interdisciplinary Studies in the Humanities | 2009- | Stanford University | . | . |
| Occasional paper (San Diego Society of Natural History) | 1968-1986 | BioDiversity Heritage Library | . | . |
| Occasional Paper Canadian Wildlife Service | 1995- | Environment Canada | . | . |
| Occasional paper Royal College of General Practitioners | 1990-2012 | PubMed Central | . | Cambio de: Journal of the Royal College of General Practitioners. Occasional paper |
| Occasional Paper Series | 2015- | Bank Street College of Education | . | . |
| Occasional Paper Series Institute of Public Finance | 1997- | Institute of Public Finance (Croatia) | . | . |
| Occasional papers - San Diego Society of Natural History | 1936-1986 | BioDiversity Heritage Library | . | . |
| Occasional papers - San Diego Society of Natural History | 1936-1954 | BioDiversity Heritage Library | . | . |
| Occasional papers / Tulane University, Museum of Natural History | 1977-1994 | BioDiversity Heritage Library | . | . |
| Occasional Papers in Sociology and Anthropology | 1987- | Nepal Journals Online | . | . |
| Occasional papers of Bernice P. Bishop Museum | 1898-1922 | BioDiversity Heritage Library | . | . |
| Occasional papers of the Boston Society of Natural History | 1880-1925 | BioDiversity Heritage Library | . | . |
| Occasional papers of the California Academy of Sciences | 1890-2013 | BioDiversity Heritage Library | . | . |
| Occasional papers of the Farlow Herbarium of Cryptogamic Botany | 1969-1987 | BioDiversity Heritage Library | . | . |
| Occasional papers of the Farlow Herbarium of Cryptogamic Botany | 1969-1987 | BioDiversity Heritage Library | . | . |
| Occasional papers of the Museum of Natural History, the University of Kansas | 1994-1996 | BioDiversity Heritage Library | . | . |
| Occasional papers of the Museum of Natural History, the University of Kansas | 1971-1994 | BioDiversity Heritage Library | . | . |
| Occasional Papers of the Museum of Zoology Louisiana State University | 1938-1994 | SORA | . | . |
| Occasional papers of the Museum of Zoology, University of Michigan | 1913-1924 | BioDiversity Heritage Library | . | . |
| Occasional papers of the San Diego Society of Natural History | 1959-1964 | BioDiversity Heritage Library | . | . |
| Occasional Papers on Mollusks. Museum of Comparative Zoology. Harvard University | 1945-1998 | BioDiversity Heritage Library | . | . |
| Occhialì: Rivista sul Mediterraneo Islamico | 2017- | University of Calabria | . | . |
| Occupational and Environmental Medicine | 1944-2007 | BMJ Publishing Group | . | Cambio de: British journal of industrial medicine |
| Occupational and Environmental Medicine | 1994-2007 | PubMed Central | . | Cambio de: British journal of industrial medicine |
| Occupational Hazards | 1996- | Penton Media | . | . |
| Occupational Health and Safety | 1999- | Stevens Publishing Corporation | . | . |
| Occupational Health Journal | 2023- | J-STAGE, Japan Science and Technology Information Aggregator, Electronic | . | . |
| Occupational Health Review | 2020- | J-STAGE, Japan Science and Technology Information Aggregator, Electronic | . | . |
| Occupational Hygiene and Health Promotion | 2018- | Yektaweb co | . | . |
| Occupational Medicine | 1996- excepto últimos 12 meses | Oxford Academic | . | . |
| Occupational Medicine | 2008- excepto últimos 12 meses | PubMed Central | Artículos selectos | . |
| Occupational Outlook Handbook | 2003- | U.S. Department of Labor, Bureau of Labor Statistics | . | . |
| Occupational Outlook Quarterly | 1999- | U.S. Department of Labor, Bureau of Labor Statistics | . | Cambio a: Career Outlook |
| Occupational Therapy International | 2017- | PubMed Central | . | . |
| Occupational Therapy International | 2017- | Hindawi Publishing Corporation | . | . |
| Occursus - Revista de Filosofia | 2016- | Universidade Estadual do Ceará | . | . |
| Ocean & Coastal Law Journal | 2011- | University of Maine | . | . |
| Ocean & polar research | 1999- | Korea Science | . | . |
| Ocean & polar research | 1979- | Korea Ocean Research and Development Institute | . | . |
| Ocean Acidification | 2012-2012 | Portico | . | . |
| Ocean and Coastal Research | 2020- | SciELO (Brasil) | . | . |
| Ocean and Society | 2025- | Cogitatiopress | . | . |
| Ocean Ecosystems | 2025- | BioMed Central | . | . |
| Ocean Science | 2005- | Copernicus Publications | . | . |
| Ocean Science Discussions | 2004- | Copernicus Publications | . | . |
| Ocean Systems Engineering | 2011- | Techno Press | . | . |
| Ocean-Land-Atmosphere Research | 2022- | American Association for the Advancement of Science | . | . |
| Oceania Newsletter | 1992- | Centre for Pacific and Asian Studies, University of Nijmegen | . | . |
| Oceanide | 2009- | Sociedad Española de Dietética y Ciencias de la Alimentación | . | . |
| Oceanides | 2003- | IPN-CICMAR | . | Cambio de: Investigaciones marinas CICIMAR |
| Oceanography | 1988- | The Oceanography Society (TOS) | . | . |
| Oceanography in Japan | 1992- excepto últimos 6 meses | National Institute of Informatics Japan | . | . |
| Oceanography in Japan | 1992- | J-STAGE, Japan Science and Technology Information Aggregator, Electronic | . | . |
| Oceanologia | 1971- | Polska Akademia Nauk | . | . |
| Oceanologia | 2011- | Elsevier Science | . | . |
| Oceanologia | 2011- | Polska Akademia Nauk | . | . |
| Oceans | 2019- | MDPI AG | . | . |
| Oceanus | 1996- | Woods Hole Oceanographic Institution | . | . |
| Oceanus | 1952-2007 | BioDiversity Heritage Library | . | . |
| Ochrana Dikoj Prirody | 2001- | Centr Ochrany Dikoj Prirody | . | . |
| Ochrona Dziedzictwa Kulturowego | 2016- | Lublin University of Technology | . | . |
| Ochrona Srodowiska i Zasobów Naturalnych | 2013- | Sciendo | . | . |
| Ochsner Journal | 2000- | Allen Press | . | . |
| Ochsner Journal | 1999- | PubMed Central | . | . |
| OCL - Oilseeds and fats Crops and Lipids | 2013- | EDP Sciences | . | Cambio de: Oléagineux, Corps gras, Lipides |
| OCL oléagineux corps gras lipides | 2000-2013 | EDP Sciences | . | Cambio a: OCL |
| OCLC Abstracts | 1998-2020 | Online Computer Library Center | . | . |
| Ocnos Revista de estudios sobre lectura | 2005- | Universidad de Castilla-La Mancha | . | . |
| Ocnos Revista de estudios sobre lectura | 2005- | Red ALyC | . | . |
| Ocnos Revista de estudios sobre lectura | 2005- | Dialnet | . | . |
| Octa Journal of Biosciences | 2013- | Scientific Planet Society | . | . |
| Octa Journal of Environmental Research | 2013- | Scientific Planet Society | . | . |
| Octahedron Drug Research | 2022- | Egyptian Journals | . | . |
| Ocula Occhio semiotico sui media | 2000- | Associazione Ocula | . | . |
| Ocular Genetics and Omics | 2024- | Elsevier Science | . | . |
| Ocular Oncology and Pathology | 2014- | PubMed Central | . | . |
| Ocular Surgery News Latin American Edition | 2004- | Healio | . | . |
| Oculum Ensaios | 2015- | Pontifícia Universidade Católica de Campinas | . | . |
| Oculum Ensaios | 2000- | PUC-Campinas | . | . |
| Oculum Ensaios | 2005- | Red ALyC | . | . |
| Odd Fellows' Magazine | 1843-1845 | Australian Cooperative Digitisation Project | . | . |
| ODEON Observatorio de Economía y Operaciones Numéricas | 2004- | Universidad Externado de Colombia | . | . |
| Odesa National University Herald. Library studies, Bibliography studies, Bibliology | 2007- | I.I.Mechnikov National University | . | . |
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| Odessa National University Herald: Chemistry | 2007- | Odessa I. I. Mechnikov National University | . | . |
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| ODI Poverty Briefing Overseas Development Institute | 1998- | Overseas Development Institute (England) | . | . |
| Odisea Revista de Estudios Ingleses | 2001- | Universidad de Almería | . | . |
| Odisea Revista de Estudios Migratorios | 2014- | Universidad de Buenos Aires | . | . |
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| Odisha Journal of Ophthalmology | 2022- | MedKnow | . | . |
| Odisseia | 2008- | Universidade Federal do Rio Grande do Norte | . | . |
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| Odonatologica | 2019- | Bioone | . | . |
| Odonatologica | 1972-2010 | Naturalis Biodiversity Center | . | . |
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| Odonto Pediatría Actual | 2011- | Imbiomed | . | . |
| ODONTO: Dental Journal | 2015- | Universitas Islam Sultan Agung | . | . |
| Odontoestomatología | 2009- | SciELO (Uruguay) | . | Cambio de: Anales de la Facultad de Odontología |
| Odontoestomatología | 2009- | Red ALyC | . | Cambio de: Anales de la Facultad de Odontología |
| Odontoestomatología | 2009- | Universidad de la República del Uruguay | . | Cambio de: Anales de la Facultad de Odontología |
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| Ohio History | 1887-2004 | Ohio Historical Society | . | . |
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| Oikos Revista de la Escuela de Administración y Economía | 2007- | Dialnet | . | . |
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