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| 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 mutum Revista de literatura e pensamento | 2013- | 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'San Trocado Anuario dedicado al Trino San Torcuato | 1963 | Galiciana | . | . |
| o-bib. Das offene Bibliotheksjournal | 2014- | Verein Deutscher Bibliothekarinnen und Bibliothekare (VDB) | . | . |
| OADI Rivista dell'Osservatorio per le Arti Decorative in Italia | 2010- | Università degli Studi di Palermo | . | . |
| OAH Magazine of History | 1996- | Organization of American Historians | . | . |
| 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 | . | . |
| Oberoende | 2003- | RFHL | . | . |
| Obesity | 2006- excepto últimos 12 meses | Wiley Online Library | . | Cambio de: Obesity Research |
| Obesity Facts | 2008-2019 | PubMed Central | . | . |
| Obesity Facts | 2008- | Karger Publishers | . | . |
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| Obesity Science & Practice | 2015- | Wiley Online Library | . | . |
| Obesity Science & Practice | 2015-2019 | 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 | . | . |
| 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. | . | . |
| OBMigra revista migracoes internacionais | 2015- | Universidade de Brasília | . | . |
| Obra digital: revista de comunicación | 2011- | RACO | . | . |
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| Obrana a Strategie | 2001- | University of Defence | . | . |
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| Obras y proyectos | 2011- | SciELO (Chile) | . | . |
| Obrazovanie i Nauka | 2012- | elpub.ru | . | . |
| Obrazovanie i Samorazvitie | 2006- | Kazan Federal University | . | . |
| Obrero El órgano de la Agrupación Socialista Ferrolana y defensor de la clase trabajadora | 1932-1936 | Galiciana | . | . |
| Observar | 2007- | RACO | . | . |
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| 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 | . | . |
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| Observatorio da imprensa | . | . | . | . |
| Observatório da Jurisdição Constitucional | 2008- | Instituto Brasiliense de Direito Público | . | . |
| Observatório da Religião | 2014- | Universidade do Estado do Pará | . | . |
| Observatorio de Colombia Ob&Co | 2008- | Centro Argentino de Estudios Internacionales | Temporalmente sin acceso | . |
| Observatorio de la Economia y la Sociedad China | 2007- | El Grupo de Investigacion Eumed.net | . | . |
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| Observatorio de Venezuela | 2008- | Centro Argentino de Estudios Internacionales | Temporalmente sin acceso | . |
| 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 | . | . |
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| Occasional Paper Canadian Wildlife Service | 1995- | Environment Canada | . | . |
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| 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 / 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 | 1890-2003 | 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 | . | . |
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| Occasional Papers on Mollusks. Museum of Comparative Zoology. Harvard University | 1945-1998 | BioDiversity Heritage Library | . | . |
| Occupational and Environmental Medicine | 1944-2007 | HighWire Press, Stanford University | . | Cambio de: British journal of industrial medicine |
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| Ocean & Coastal Law Journal | 2011- | University of Maine | . | . |
| Ocean & polar research | 1999- | Korea Science | . | . |
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| Ocean Acidification | 2014- | de Gruyter | . | . |
| Ocean Science | 2005- | Copernicus Publications | . | . |
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| Ocean Systems Engineering | 2011- | Techno Press | . | . |
| Oceania Newsletter | 1992-2012 | Centre for Pacific and Asian Studies, University of Nijmegen | . | . |
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| Oceanides | 2003- | IPN-CICMAR | . | Cambio de: Investigaciones marinas CICIMAR |
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| Oceanography in Japan | 1992- excepto últimos 6 meses | National Institute of Informatics Japan | . | . |
| Oceanography in Japan | 1992-2005 | J-STAGE, Japan Science and Technology Information Aggregator, Electronic | . | . |
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| Oceanologia | 2011- | Elsevier Science | . | . |
| Oceanologia | 2011- | Polska Akademia Nauk | . | . |
| Oceans | 2019- | MDPI AG | . | . |
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| Ochrana Dikoj Prirody | 2001- | Centr Ochrany Dikoj Prirody | . | . |
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| Ocnos Revista de estudios sobre lectura | 2005- | Universidad de Castilla-La Mancha | . | . |
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| Odisea Revista de Estudios Ingleses | 2001- | Universidad de Almería | . | . |
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| Odontoestomatología | 2009- | SciELO (Uruguay) | . | Cambio de: Anales de la Facultad de Odontología |
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