| Titulo | Fecha | Proveedor | Acceso | Cambio de titulo |
| O Biológico | 2000- | Instituto Biologico Sao Paolo | . | . |
| O eixo e a roda Revista de literatura brasileira | 1982- | Universidade Federal de Minas Gerais | . | . |
| 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? | 2008- | 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 | . | . |
| 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- excepto últimos 12 meses | NAi Publishers | . | . |
| OASE Journal for Architecture | 2010- | OASE Foundation | . | . |
| 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 'Études 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 | 2008-2011 | PubMed Central | Artículos selectos | . |
| Obesity Facts | 2008- | Karger Publishers | . | . |
| Obesity research | 1993-2005 | Wiley Online Library | . | Cambio a: Obesity |
| Obesity Science & Practice | 2015- | Wiley Online Library | . | . |
| OBG Management | 2000- | Dowden Health Media | . | . |
| OBIHIRO OTANI JUNIOR COLLEGE Center for Regional collaboration | 2016- | J-STAGE, Japan Science and Technology Information Aggregator, Electronic | . | . |
| OBMigra revista migracoes internacionais | 2015- | Universidade de Brasília | . | . |
| Obra digital e-monografies en l'Ã mbit de la comunicació digital | 2011- | RACO | . | . |
| Obra digital e-monografies en l'Ã mbit de la comunicació digital | 2011- | Universitat de Vic | . | . |
| Obrana a Strategie | 2001- | University of Defence | . | . |
| Obras | 1999- | . | . | . |
| Obras malacologicas | 1890-1907 | BioDiversity Heritage Library | . | . |
| Obras y proyectos | 2011- | SciELO (Chile) | . | . |
| Obrero El órgano de la Agrupación Socialista Ferrolana y defensor de la clase trabajadora | 1932-1936 | Galiciana | . | . |
| Observar | 2007- | University of Barcelona | . | . |
| Observar | 2007- | RACO | . | . |
| Observationes Botanicae in Horto Dickensi Notatae | 1820-1822 | DIGI Zeitschriften | . | . |
| Observations astronomiques faites à l'Observatoire impérial de Paris | 1803-1846 | 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 | BioDiversity Heritage Library | . | . |
| Observatoire de la société britannique | 2006- excepto últimos 12 meses | Revues.org | . | . |
| 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 | . | . |
| Observatorio de la Economia y la Sociedad China | 2007- | El Grupo de Investigacion Eumed.net | . | . |
| Observatorio de Paraguay | 2007- | Centro Argentino de Estudios Internacionales | . | . |
| Observatorio de Uruguay | 2007- | Centro Argentino de Estudios Internacionales | . | . |
| Observatorio de Venezuela | 2008- | Centro Argentino de Estudios Internacionales | . | . |
| 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- | Red ALyC | . | . |
| Observatorio Malvinense Ob&Mv | 2007- | Centro Argentino de Estudios Internacionales | . | . |
| 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 polar Ob&Po | 2008- | Centro Argentino de Estudios Internacionales | . | . |
| Observatorio Social de América Latina OSAL | 2000- | CLACSO - Consejo Latinoamericano de Ciencias Sociales | . | . |
| Observatorium Revista Electronica de Geografia | 2009- | Universidade Federal de Uberlândia | . | . |
| Observatory | 1949-1999 | NASA Astrophysics Data System | . | . |
| Observer and record of agriculture Science and art | 1839-1839 | BioDiversity Heritage Library | . | . |
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| Observervatorio de Ecuador Ob&Ec | 2008- | Centro Argentino de Estudios Internacionales | . | . |
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| Obstetrics and Gynecology International | 2009- | Hindawi Publishing Corporation | . | . |
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| Occasion Interdisciplinary Studies in the Humanities | 2009- | Stanford University | . | . |
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| 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 | 1890-1993 | 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 | 1971-1994 | 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 Zoology, University of Michigan | 1913-1924 | BioDiversity Heritage Library | . | . |
| Occasional Papers on Mollusks. Museum of Comparative Zoology. Harvard University | 1945-1998 | BioDiversity Heritage Library | . | . |
| Occupational and Environmental Medicine | 1944-2005 | HighWire Press, Stanford University | Registro individual requerido | 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 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 |
| 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 | 2014- | de Gruyter | . | . |
| Ocean Science | 2005- | Copernicus Publications | . | . |
| Ocean Science Discussions | 2004- | Copernicus Publications | . | . |
| Ocean Systems Engineering | 2011- | Korea Science | . | . |
| Oceania Newsletter | 1992-2012 | 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 | 1992-2005 | J-STAGE, Japan Science and Technology Information Aggregator, Electronic | . | . |
| Oceanologia | 1971- | Polska Akademia Nauk | . | . |
| Oceanologia | 2011- | Elsevier Science | . | . |
| Oceanologia | 2011- | Polska Akademia Nauk | . | . |
| Oceanological & Hydrobiological Studies | 2007-2010 | de Gruyter | . | . |
| Oceanus | 1996- | Woods Hole Oceanographic Institution | . | . |
| Oceanus | 1952-2007 | BioDiversity Heritage Library | . | . |
| Ochrana Dikoj Prirody | 2001- | Centr Ochrany Dikoj Prirody | . | . |
| Ochrona Srodowiska i Zasobów Naturalnych | 2013- | de Gruyter | . | . |
| Ochsner Journal | 2000- | Allen Press | . | . |
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| OCL - Oilseeds and fats Crops and Lipids | 2009- | EDP Sciences | . | . |
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| 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 | . | . |
| Ocula Occhio semiotico sui media | 2000- | Associazione italiana di studi semiotici | . | . |
| Ocular Oncology and Pathology | 2014- excepto últimos 12 meses | PubMed Central | . | . |
| Ocular Surgery News Latin American Edition | 2004- | Healio | . | . |
| 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 | . | . |
| ODI Briefing Paper Overseas Development Institute | 1993- | Overseas Development Institute (England) | . | . |
| ODI Poverty Briefing Overseas Development Institute | 1998- | Overseas Development Institute (England) | . | . |
| Odiseo Revista electrónica de pedagogía | 2003- | Odiseo | . | . |
| Odisseia | 2008- | Universidade Federal do Rio Grande do Norte | . | . |
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| Odonto Pediatría Actual | 2011- | Imbiomed | . | . |
| Odontoestomatología | 2009- | SciELO (Uruguay) | . | Cambio de: Anales de la Facultad de Odontología |
| Odontoestomatología | 2009- | Red ALyC | . | Cambio de: Anales de la Facultad de Odontología |
| Odontología | 1975-1981 | Universidad Nacional Mayor de San Marcos, Peru. | . | . |
| Odontología | 2014- | Universidad Central del Ecuador | . | . |
| Odontología Actual | 2011- | Imbiomed | . | . |
| Odontologia clinico cientifica | 2003- | Conselho Rergional de Odontologia de Pernambuco | . | . |
| Odontología Pediátrica | 2008- | Imbiomed | . | . |
| Odontología Pediátrica | 2010- | Revistas Peruanas | . | . |
| Odontología Sanmarquina | 1993- | Universidad Nacional Mayor de San Marcos, Peru. | . | . |
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| Odontólogo Moderno | 2005- | Imbiomed | . | . |
| Odontos | 2010- | Universidad de Costa Rica | . | . |
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| Odous Científica | 2000- | Universidad de Carabobo | . | . |
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| OECD Guidelines for the Testing of Chemicals | 2000-2007 | Ingenta plc | . | . |
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| OECD Papers | 2001-2008 | Ingenta plc | . | Cambio a: OECD Journal: General Papers |
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| Oecologia Australis | 2010- | Universidade Federal do Rio de Janeiro | . | Cambio de: Oecologia Brasiliensis |
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| Office Systems Research Journal | 1999-1999 | Organizational Systems Research Association | . | Cambio a: Information Technology, Learning, and Performance Journal |
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| On the waterfront | 1998- | Universitat de Barcelona | . | . |
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