| 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- | 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 | 2008-2011 | 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: revista de comunicación | 2011- | RACO | . | . |
| Obra digital: revista de comunicación | 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- | 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 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 | 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 | 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 | Temporalmente sin acceso | . |
| Observatorio de la Economia y la Sociedad China | 2007- | El Grupo de Investigacion Eumed.net | . | . |
| Observatorio de Paraguay | 2007- | Centro Argentino de Estudios Internacionales | Temporalmente sin acceso | . |
| Observatorio de Uruguay | 2007- | Centro Argentino de Estudios Internacionales | Temporalmente sin acceso | . |
| 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 | . | . |
| Observatorio Laboral Revista Venezolana | 2008- | Dialnet | . | . |
| Observatorio Laboral Revista Venezolana | 2008- | Red ALyC | . | . |
| Observatorio Malvinense Ob&Mv | 2007- | Centro Argentino de Estudios Internacionales | Temporalmente sin acceso | . |
| 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 | Temporalmente sin acceso | . |
| 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 | . | . |
| Observer London England | 1998- | Guardian Newspapers Limited | . | . |
| Observervatorio de Ecuador Ob&Ec | 2008- | Centro Argentino de Estudios Internacionales | Temporalmente sin acceso | . |
| Obstetric Medicine | 2008- excepto últimos 12 meses | PubMed Central | . | . |
| 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 |
| Obstetrics and Gynecology International | 2009- | Hindawi Publishing Corporation | . | . |
| Obstetrics and Gynecology International | 2009- | PubMed Central | . | . |
| Occasion Interdisciplinary Studies in the Humanities | 2009- | Stanford University | . | . |
| 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 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 | . | . |
| Occasional papers of the Museum of Natural History, the University of Kansas | 1971-1994 | 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 | . | . |
| 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 | 1994- | 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 | . | . |
| 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) | . | . |
| Odisea Revista de Estudios Migratorios | 2014- | Universidad de Buenos Aires | . | . |
| Odiseo Revista electrónica de pedagogía | 2003- | Odiseo | . | . |
| Odisseia | 2008- | Universidade Federal do Rio Grande do Norte | . | . |
| Odonatologica | 1972-2010 | Societas Internationalis Odonatologica | . | . |
| Odonto | 2007- | Universidade Metodista de São Paulo | . | . |
| 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 | 2002- | Sociedad Peruana de Odontopediatría | . | . |
| Odontología Sanmarquina | 1993- | Universidad Nacional Mayor de San Marcos, Peru. | . | . |
| Odontología Sanmarquina | 1998- | Universidad Nacional Mayor de San Marcos, Peru. | . | . |
| Odontólogo Moderno | 2005- | Imbiomed | . | . |
| Odontos | 2010- | Universidad de Costa Rica | . | . |
| Odous | 2000- | Universidad de Carabobo | . | . |
| Odous Científica | 2000- | Universidad de Carabobo | . | . |
| Odous Científica | 2010- | Imbiomed | registro individual requerido | . |
| OE Magazine Optical Engineering | 2001-2005 | SPIE Digital Library | . | . |
| OECD Guidelines for the Testing of Chemicals | 2000-2007 | Ingenta plc | . | . |
| OECD in Zahlen Die | 2006-2009 | OECD | . | . |
| OECD Observer | 1999- | OECD iLibrary | . | . |
| OECD Papers | 2001-2008 | Ingenta plc | . | Cambio a: OECD Journal: General Papers |
| OECD Working Papers on Public Governance | 2007- | . | . | . |
| Oecologia Australis | 2010- | Universidade Federal do Rio de Janeiro | . | Cambio de: Oecologia Brasiliensis |
| Oecologia Brasiliensis | 1995-2009 | Dialnet | . | Cambio a: Oecologia Australis |
| Oecologia Brasiliensis | 1995-2009 | Oecologia Brasiliensis | . | Cambio a: Oecologia Australis |
| Oeconomia | 2011- | Revues.org | . | . |
| Oeconomics of Knowledge | 2009- | Saphira Publishing | . | . |
| Oedippus | 1990- | Pensoft Publishers | . | . |
| Oesterreichische botanische Zeitschrift | 1858-1923 | BioDiversity Heritage Library | . | Cambio a: Plant systematics and evolution |
| Oesterreichisches botanisches Wochenblatt | 1851-1857 | BioDiversity Heritage Library | . | Cambio a: Oesterreichische Botanische Zeitschrift |
| Oesterreichisches botanisches Wochenblatt | 1851-1857 | JSTOR | . | Cambio a: Oesterreichische Botanische Zeitschrift |
| Offarm Farmacia y Sociedad | 2000-2011 | Elsevier España | . | . |
| Office Automation | 1980- excepto últimos 6 meses | National Institute of Informatics Japan | . | . |
| Office Systems Research Journal | 1999-1999 | Organizational Systems Research Association | . | Cambio a: Information Technology, Learning, and Performance Journal |
| Office Technology Solutions for Image Technology Resellers | 2002- | 101 Communications | . | . |
| Official Board Markets | 1998- | Advanstar Communications Ltd. | . | . |
| Official Bulletin Series A and B International Labour Office | 1919-1913 | International Labour Office | . | . |
| Official Journal of Japan Society of Ningen Dock | 2005- | J-STAGE, Japan Science and Technology Information Aggregator, Electronic | . | . |
| Official Journal of the European Union | 2003- | European Union | . | . |
| Official Journal of the Japan Association of Endocrine Surgeons and the Japanese Society of Thyroid Surgery | 2012- | J-STAGE, Japan Science and Technology Information Aggregator, Electronic | . | . |
| Official Journal of the Japanese Society of Human Dry Dock | 1986-2005 | J-STAGE, Japan Science and Technology Information Aggregator, Electronic | . | . |
| Official Journal of the Japanese Society of Interventional Radiology | 2010- | J-STAGE, Japan Science and Technology Information Aggregator, Electronic | selecciones disponibles | . |
| Official Journal of the Japanese Teratology Society | 1963-1986 | National Institute of Informatics Japan | . | . |
| Officiel art | 2010- | Éditions Jalou | . | . |
| Officiel de la mode | 1921- | Jalou Gallery | . | . |
| Officina della Storia | 2008- | Università degli Studi della Tuscia | . | . |
| Óffnungszeiten Papiere zur Designwissenschaft | 2012- | Fachhochschule Lübeck | . | . |
| Offshore | 1995- | PennWell Corporation | . | . |
| Oficina do Historiador | 2010- | Pontificia Universidade Católica do Rio Grande do Sul | . | . |
| Oficios Terrestres | 1995- | Universidad Nacional de la Plata | . | . |
| Oficios Terrestres | 2011- | Universidad Nacional de la Plata | . | . |
| Ogigia Revista Electrónica de Estudios HispAnicos | 2007- | Valladolid University | . | . |
| OGIRISI a New Journal of African Studies | 2008- | AJOL | . | . |
| Oglinda literarã Revista de culturã civilizatie s i atitudine | 2008- | . | . | . |
| Ohio beetles bulletin Occasional publication of the Ohio Coleopterists | 2009-2016 | BioDiversity Heritage Library | . | . |
| Ohio Geology | 1981- | Ohio Department of Natural Resources, | . | . |
| Ohio History | 1887-2004 | Ohio Historical Society | . | . |
| Ohio Journal of Science | 1900-1914 | Ohio State University | . | . |
| Ohio Journal of Science | 1900-1922 | BioDiversity Heritage Library | . | . |
| Ohio Journal of Science | 2014- | Ohio Academy of Science' | . | . |
| Ohio Mining Journal | 1882-1898 | Ohio State University | . | . |
| Ohio Mycological Bulletin | 1903-1908 | BioDiversity Heritage Library | . | Cambio a: Mycological Bulletin |
| Ohio Mycological Bulletin | 1903-1903 | JSTOR | . | Cambio a: Mycological Bulletin |
| Ohio naturalist | 1900-1915 | BioDiversity Heritage Library | . | . |
| Ohio naturalist and journal of science | 1900-1912 | Hathitrust | . | Cambio de: O.S.U. naturalist |
| Ohio State Law Journal | 2000- | Ohio State University, College of Law | . | . |
| Ohio State online music journal OSOM | 2008- | Ohio State University | . | . |
| Ohio Valley History | 2001-2006 | Cincinnati Museum Center | . | . |
| OHM Obradoiro de historia moderna | 1992- | Universidad de Santiago de Compostela | . | . |
| Oideion Performing Arts Online | 1997-1999 | Research School of Asian, African and Amarindian Studies , Leiden | . | . |
| Oikos | 1987- | Universidad de Antioquia | . | . |
| Oikos Publicación del Instituto de Ecología UNAM | 1990- | Instituto de Ecologia, UNAM | . | . |
| Oikos Publicación del Instituto de Ecología UNAM | 1992- | BioDiversity Heritage Library | . | . |
| Oikos Revista de la Escuela de Administración y Economía | 2007- | Dialnet | . | . |
| OIKOS Rio de Janeiro | 2002- | Universidade Federal do Rio de Janeiro | . | . |
| Oil & Gas Science and Technology | 1999- | EDP Sciences | . | Cambio de: Revue de l'Institut français du pétrole |
| Oil and Gas Business | 2001- | Ufa State Petroleum Technological University | . | . |
| Oil and Gas Business | 2001- | Ufa State Petroleum Technological University | . | . |
| Oil Crops Outlook | 1995- | U.S. Department of Agriculture | . | . |
| OIT Times Office of Industrial Technologies | 1997-2002 | U.S. Department of Energy, Office of Industrial Technologies | . | . |
| OJS pa dansk | 2010- | Aarhus Universitet | . | . |
| Okajimas Folia Anatomica Japonica | 1936- | J-STAGE, Japan Science and Technology Information Aggregator, Electronic | . | . |
| OKARA Geografia em Debate | 2007- | Universidade Federal da Paraíba | . | . |
| Okayama Igakkai Zasshi Journal of Okayama Medical Association | 1947- | J-STAGE, Japan Science and Technology Information Aggregator, Electronic | selecciones disponibles | . |
| Okayama Igakkai Zasshi Journal of Okayama Medical Association | 1889-1944 | J-STAGE, Japan Science and Technology Information Aggregator, Electronic | . | . |
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| Oklahoma archeology Journal of the Oklahoma Anthropological Society | 2002- | Oklahoma Anthropological Society | . | . |
| Oklahoma librarian | 2010- | Oklahoma Library Association | . | . |
| Oklahoma Native Plant Record | 2001- | Oklahoma State University | . | . |
| Oklahoma Politics | 1992- | Oklahoma State University | . | . |
| Oklahoma Water Resources Research Institute | 1966- | Oklahoma State University | . | . |
| Oktjabr | 1996- | Oktjabr | . | . |
| Ola financiera | 2008- | UNAM | . | . |
| Ola financiera | 2015- | SciELO (Mexico) | . | . |
| Ola financiera | 2008- | UNAM | . | . |
| OLA Quarterly | 1995- | Oregon Library Association | . | . |
| Old Age Psychiatrist | 2010- | Royal College of Pharmacists, Faculty for the Psychiatry of Old Age | . | . |
| Old English newsletter | 1998- | University of Tennessee | . | . |
| Old Guard | 1863-1867 | Making of America Project Cornell | . | . |
| Old Guard | 1864- | Making of America Project Michigan | . | . |
| Old Potter's Almanack The | 2009- | Universitatsbibliothek Heidelberg | . | . |
| Old Testament Essays | 2008- | SciELO (South Africa) | . | . |
| Oldman River Dam ... raptor mitigation program | 1990-1993 | BioDiversity Heritage Library | . | . |
| Oleoscience | 2001- | J-STAGE, Japan Science and Technology Information Aggregator, Electronic | . | . |
| Olhar de Professor | 2001- | Red ALyC | . | . |
| Olhar de Professor | 1998- | Universidade Estadual de Ponta Grossa | . | . |
| Olhares & trilhas | 2000- | Universidade Federal de Uberlândia | . | . |
| Olho d'água | 2009- | Universidade Estadual Paulista | . | . |
| Oligonucleotides | 2008- excepto últimos 12 meses | PubMed Central | Artículos selectos | . |
| Oliva La Periódico de política literatura e intereses materiales | 1856-1892 | Galiciana | . | . |
| Olivar Revista de literatura y cultura españolas | 2006- | Dialnet | . | . |
| Olivar Revista de literatura y cultura españolas | 2001- | SciELO (Argentina) | . | . |
| Olivar Revista de literatura y cultura españolas | 2000- | Universidad Nacional de la Plata | . | . |
| Olivar Revista de literatura y cultura españolas | 2000- | Universidad Nacional de la Plata | . | . |
| Oliviana Mouvements et dissidences spirituels XIIIe XIVe siècles | 2003-2012 | Revues.org | . | . |
| Oliviana Recherches sur Petrus Loannis Olivi et les courants spirituels XIIe Xve siècles | 2003- | Revues.org | . | . |
| Olney Interface timber sale project initial proposal timber sale project | 2008-2008 | BioDiversity Heritage Library | . | . |
| Olsztyn Economic Journal | 2007- | University of Warmia and Mazury in Olsztyn | . | . |
| Oman Journal of Ophthalmology | 2008- | Wolters Kluwer Health - Medknow | . | . |
| Oman Journal of Ophthalmology | 2009- | PubMed Central | . | . |
| Oman Medical Journal | 2007- | Oman Medical Specialty Board | . | . |
| Oman Medical Journal | 2007- | PubMed Central | . | . |
| OMB Watcher Office of Management and Budget | 2000- | OMB Watch | . | . |
| Ombudsman of Spain Summary of the report to Parliament | 2003- | Defensor del Pueblo | . | . |
| Omertaa Journal for applied anthropology | 2007- | Omertaa | . | . |
| OMICS a Journal of Integrative Biology | 2008- excepto últimos 12 meses | PubMed Central | Artículos selectos | . |
| Omj | 2000-2006 | Australian Museums & Galleries Online | . | . |
| Omnia | 1995- | Universidad del Zulia | . | . |
| Omnia | 2001- | Red ALyC | . | . |
| Omnibus and Sydney Spectator Australia | 1841-1843 | Australian Cooperative Digitisation Project | . | . |
| Omónoia La Concorde Journal politique littéraire et commercial | 1870-1883 | Gallica. Bibliothèque Nationale Paris | . | . |
| On common ground Strenghtening teaching through school unversity partnership | 1993- | . | . | . |
| On our terms The undergraduate journal of the Athena Center for Leadership Studies | 2013- | Columbia University | . | . |
| On politcs op | 2005- | University of Victoria | . | . |
| On Tap magazine | 2001- | National Drinking Water Clearinghouse | . | . |
| On the waterfront | 1998- | RACO | . | . |
| On the waterfront | 1998- | Universitat de Barcelona | . | . |
| On the waterfront Newsletter of the friends of the International Institute of Social History | 2000- | International Institute of Social History | . | . |
| Oñati Socio Legal Series | 2011- | Oñati International Institute for the Sociology of Law | . | . |
| Oncogene | 1997-2010 | Nature Publishing Group | . | . |
| Oncogenesis | 2012- | Nature Publishing Group | . | . |
| Oncogenesis | 2012- | PubMed Central | . | . |
| Oncoimmunology | 2012- excepto últimos 12 meses | Taylor & Francis | . | . |
| Oncoimmunology | 2012- excepto últimos 12 meses | PubMed Central | . | . |
| Oncologia | 1998- | Imbiomed | Registro individual requerido | . |
| Oncología Barcelona | 2004-2007 | SciELO (España) | . | . |
| Oncologia Veterinaria | 2001- | Centro Oncologico Veterinario Olivos (Argentina) | . | . |
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