| Titulo | Fecha | Proveedor | Acceso | Cambio de titulo |
| Ophthalmology Science | 2021- | PubMed Central | . | . |
| Ophthalmology Times | 2001- | Advanstar Communications Ltd. | . | . |
| Opinião Pública | 2000- | SciELO (Brasil) | . | . |
| Opinião Pública | 2000- | Red ALyC | . | . |
| Opinião Pública | 1993- | UNICAMP | . | . |
| Opinion Armed Forces War College | 2013-2015 | National Defence University | . | . |
| Opinión Barcelona | 2008- | CIDOB | . | . |
| Opinión del país La La Coruña 1896 | 1896 | Galiciana | . | . |
| Opinión gallega | 1945-1953 | Galiciana | . | . |
| Opinión gallegista | 1934-1935 | Galiciana | . | . |
| Opinion La diario de Pontevedra | 1896-1897 | Galiciana | . | . |
| Opinion La semanario independiente | 1911 | Galiciana | . | . |
| Opìr Materìalìv ì Teorìâ Sporud | 2009- | Kyiv National University of Construction and Architecture | . | . |
| Opisthobranch | 1984-1984 | BioDiversity Heritage Library | . | . |
| Opisthobranch newsletter | 1969-1983 | BioDiversity Heritage Library | . | . |
| Opolis An International Journal of Suburban and Metropolitan Studies | 2004-2006 | University of California | . | . |
| Opolskie Studia Administracyjno-Prawne | 2016- | Wydawnictwo Uniwersytetu Opolskiego | . | . |
| OPSI | 2016- | Universitas Pembangunan Nasional 'Veteran' Yogyakarta | . | . |
| OPSIS Revista do Departamento de História e Ciências Sociais | 2001- | Universidade Federal de Goiás | . | . |
| Optica | 2014- | Optica Publishing Group | . | . |
| Optica Applicata | 1971- | Wroclaw University of Technology | . | . |
| Óptica Pura y Aplicada | 1990- | Sociedad Española de Optica - Sedoptica | . | . |
| Optical Data Processing and Storage | 2015- | de Gruyter | . | . |
| Optical Materials Express | 2011- | Optica Publishing Group | . | . |
| Optical Materials X | 2019- | Elsevier Science | . | . |
| Optical Nanoscopy | 2012-2014 | SpringerOpen | . | . |
| Optical Review | 1994-1999 | J-STAGE, Japan Science and Technology Information Aggregator, Electronic | . | . |
| Opticon1826 | 2006-2015 | University College London | . | . |
| Optics | 2020- | MDPI AG | . | . |
| Optics and Photonics Journal | 2011- | Scientific Research Publishing | . | . |
| Optics and Photonics Letters | 2008- | World Scientific Publishing Company | . | . |
| Optics Continuum | 2022- | Optica Publishing Group | . | Cambio de: OSA Continuum |
| Optics Express | 2009- excepto últimos 12 meses | PubMed Central | Artículos selectos | . |
| Optics Express | 1997- | Optica Publishing Group | . | . |
| Optik & Photonik | 2006-2018 | Wiley Online Library | . | . |
| Optima Newsletter | 1996-2015 | OPTIMA - Organization for the Phyto-Taxonomic Investigation of the | . | . |
| Optimum economic studies | 2013- | CEEOL | . | . |
| Optimum Ekonomi ve Yonetim Bilimleri Dergisi | 2014- | Dergipark | . | . |
| Optimum Online | 1998-2019 | Wayback Machine | . | . |
| Opto and Laser Europe | 2001- | Optics | . | . |
| Opto Electronic Advances | 2021- | Institue of Optics and Electronics, Chinese Academy of Sciences | . | . |
| Opto-Electronics Review | 1992-2005 | Polish Academy of Sciences | . | . |
| Opto-Electronics Review | 2015- | Polish Academy of Sciences | . | . |
| Optoelectronics and Advanced Materials-Rapid Communications | 2007- | National Institute of Optoelectronics | . | . |
| Optofluidics Microfluidics and Nanofluidics | 2014- | de Gruyter | . | Cambio de: Optofluidics |
| Optogenetics | 2013-2013 | Portico | . | . |
| Optometria clinica y ciencias de la vision | 2022- | Sociedad Aragonesa de Optometría y Contactología | . | . |
| Optometric Education | 2008- | Association of Schools and Colleges of Optometry | . | . |
| Optometry & Vision Development | 2005-2012 | College of Optometrists in Vision Development | . | . |
| Optometry & Vision Science | 1989- excepto últimos 12 meses | Lippincott Williams & Wilkins | . | . |
| Optometry & Visual Performance | 2013- | Optometric Extension Program Foundation | . | . |
| Optometry Reports | 2011-2016 | PAGEPress | . | . |
| Opukholi zhenskoi reproduktivnoi sistemy | 2008- | . | . | . |
| Opuntia Brava | 2009- | Universidad de Ciencias Pedagógicas 'Pepito Tey'; Editorial Académica Universitaria | . | . |
| Opus | 2009- | Associação Nacional de Pesquisa e Pós-Graduação em Música | . | . |
| Opus Incertum | 2015- | Firenze University Press | . | . |
| Opuscula Annual of the Swedish Institutes at Athens and Rome | 2008- | Svenska institutet I Athen | . | . |
| Opuscula Mathematica | 2004- | AGH University of Science and Technology | . | . |
| Opuscula Musealia | 2010- | Wydawnictwo Uniwersytetu Jagiellonskiego | . | . |
| Opuscula Philolichenum | 2004- | New York Botanical Garden | . | . |
| Opuscula Short texts of the Middle Ages and Renaissance | 2011- | University of Calgary | . | . |
| Opuscula zoologica | 1957-1975 | BioDiversity Heritage Library | . | . |
| Opuscula Zoologica Instituti Zoosystematici et Oecologici Universitatis Budapestinensis | 2001- | Eötvös Loránd University | . | . |
| Opusculum | 2000- | Humboldt-Universität zu Berlin | . | . |
| Opvscvla Archaeologica Papers of the Department of Archaeology | 1956- | Hrcak | . | . |
| Opšta Medicina | 2014- | SCIndeks: Serbian Citation Index | . | . |
| Oradea Journal of Business and Economics | 2016- | University of Oradea | . | . |
| Oráfrica revista de oralidad africana | 2005- | RACO | . | . |
| Oral | 1999- | Imbiomed | Registro individual requerido | . |
| Oral | 2006- | Medigraphic | . | . |
| Oral | 2021- | MDPI AG | . | . |
| Oral & Implantology | 2008-2017 | PubMed Central | . | . |
| Oral & Implantology | 2008- | CIC Edizioni Internazionali | . | . |
| Oral & Maxillofacial Pathology Journal | 2010- | Kairali Society of Oral & Maxillofacial Pathologists | . | . |
| Oral and Maxillofacial Surgery Cases | 2015- | Elsevier Science | . | . |
| Oral Health | 2000- | Business Information Group | . | . |
| Oral Health & Preventive Dentistry | 2003- | Quintessenz Verlags-GmbH | . | . |
| Oral Health and Dental Management | 2002- | Informedica | . | . |
| Oral History Forum | 1975- | Canadian Oral History Association | . | . |
| Oral Medicine & Pathology | 1996-2012 | J-STAGE, Japan Science and Technology Information Aggregator, Electronic | . | . |
| Oral Oncology Extra | 2004-2006 | Elsevier Science | . | . |
| Oral Oncology Reports | 2022- | Elsevier Science | . | . |
| Oral Science International | 2004-2010 | J-STAGE, Japan Science and Technology Information Aggregator, Electronic | . | . |
| Oral Science International | 2004-2018 | Elsevier Science | . | . |
| Oral Sciences | 2005- | Universidade Católica de Brasilia | . | . |
| Oral Therapeutics And Pharmacology | 1982- | J-STAGE, Japan Science and Technology Information Aggregator, Electronic | selecciones disponibles | . |
| Oral Tradition | 1986- | Center for Studies in Oral Tradition | . | Cambio a: eOT: Oral Tradition |
| Oralidad | 1988-2011 | UNESCO | . | . |
| Oralidad-es | 2015- | Red Iberoamericana de Estudios de la Oralidad | . | . |
| Orapuh Journal Journal of Oral & Public Health | 2020- | Orapuh, Inc. | . | . |
| Orbicom Newsletter | 2004- | United Nations Educational, Scientific, and Cultural Organization | . | . |
| Orbis Business | 2013- | Universidad Continental | . | . |
| Orbis Idearum | 2013- | Jagiellonian University History of Ideas Research Centre | . | . |
| Orbis linguarum | 1998- | CEEOL | . | . |
| Orbis Scholae | 2006- | Univerzita Karlova v Praze | . | . |
| Orbis Tertius Revista de teoría y crítica literaria | 1996- | Universidad Nacional de la Plata | . | . |
| Orbis Tertius UPAL - Revista Académica y Científica de la Universidad Privada Abierta Latinoamericana | 2017- | Universidad Privada Abierta Latinoamericana | . | . |
| Orbis. Revista Científica Ciencias Humanas | 2005- | Dialnet | . | . |
| Orbis. Revista Científica Ciencias Humanas | 2005- | Red ALyC | . | . |
| Orbit : Writing Around Pynchon | 2012- | Ubiquity Press | . | . |
| Orbit A Journal of American Literature | 2012- | Open Library of Humanities | . | . |
| Orbit Journal | 2017-2019 | Elsevier Science | . | Cambio a: Journal of Responsible Technology |
| Orbit University of Sydney Undergraduate Research Journal | 2009- | University of Sydney | . | . |
| Orbital The Electronic Journal of Chemistry | 2009- | Universidade Federal de Mato Grosso do Sul | . | . |
| Orbith: Majalah Ilmiah Pengembangan Rekayasa dan Sosial | 2014- | Politeknik Negeri Semarang | . | . |
| Orchadian The | 1963-2015 | BioDiversity Heritage Library | . | . |
| Orchard and farm | 1922-1924 | BioDiversity Heritage Library | . | . |
| Orchard and garden | 1889-1891 | BioDiversity Heritage Library | . | . |
| Orchid Academia Siraha | 2022- | Nepal Journals Online | . | . |
| Orchid album : | 1882-1897 | BioDiversity Heritage Library | . | . |
| Orchid Research Newsletter | 1998- | Royal Botanical Gardens, Kew | . | . |
| Orchid review | 1893-1923 | BioDiversity Heritage Library | . | . |
| Orchid Science and Biotechnology | 2007-2007 | Global Science Books | . | . |
| Orchid world. A monthly illustrated journal entirely devoted to orchidology | 1910-1916 | BioDiversity Heritage Library | . | . |
| Orchidophile; journal des amateurs d'orchideés | 1881-1892 | BioDiversity Heritage Library | . | . |
| Orchis Monatsschrift der Deutschen Gesellschaft für Orchideenkunde | 1906-1920 | Botanicus | . | . |
| Orchis Monatsschrift der Deutschen Gesellschaft für Orchideenkunde | 1906-1920 | BioDiversity Heritage Library | . | . |
| Orð og Tunga | 2015- | Árni Magnússon Institute for Icelandic Studies | . | . |
| Ordenanzas municipales para la ciudad de Monforte y su término municipal | 1897 | Galiciana | . | . |
| Ordentliche wochentliche Kayserl Reichs Ober Post Amts Zeitung In Franckfurt am Mayn | 1750-1750 | Gottinger Digitalisierungs-Zentrum | . | . |
| Ordit L' l'anuari del CREM | 2007- | RACO | . | . |
| Ore Bin | 1939-1978 | Oregon Department of Geology and Mineral Industries | . | Cambio a: Oregon Geology |
| Ore Geology Reviews | 2022- | Elsevier Science | . | . |
| Oregon flora newsletter | 1995-2012 | BioDiversity Heritage Library | . | . |
| Oregon Geology | 1979- | Oregon Deparment of Geology and Mineral Industries | . | Cambio de: Ore Bin |
| Oregon grown gladiolus bulbs : March, 1927 [price list] | 1927-1927 | BioDiversity Heritage Library | . | . |
| Oregon naturalist | 1894-1898 | BioDiversity Heritage Library | . | . |
| Oregon sportsman | 1913-1918 | BioDiversity Heritage Library | . | . |
| Oregon's Agricultural Progress | 1996- | Oregon State University Extension and Experiment Station | . | . |
| Orensano periódico gallego | 1944-1945 | Galiciana | . | . |
| Orfeu | 2016- | Universidade do Estado de Santa Catarina | . | . |
| Org & Demo | 2000- | Universidade Estadual Paulista (UNESP) | . | . |
| Organ alternatives | 1998-2004 | OrgAt.com | . | . |
| Organ Biology | 2011- | J-STAGE, Japan Science and Technology Information Aggregator, Electronic | . | . |
| Organelles Proteomics | 2014-2014 | Portico | . | . |
| Organic and Medicinal Chemistry Letters | 2011-2014 | PubMed Central | . | . |
| Organic and Medicinal Chemistry Letters | 2011-2014 | SpringerOpen | . | . |
| Organic Chemistry Frontiers | 2013- | Royal Society of Chemistry | . | . |
| Organic Chemistry Insights | 2008- | CLOCKSS | . | . |
| Organic Chemistry International | 2008-2016 | Hindawi Publishing Corporation | . | . |
| Organic Communications | 2008- | ACG Publications | . | . |
| Organic Farming | 2015- | Librelloph | . | . |
| Organic Materials | 2019- | Thieme | . | . |
| Organic Photonics and Photovoltaics | 2013- | de Gruyter | . | . |
| Organic Syntheses | 1921- | CambridgeSoft | . | . |
| Organics | 2020- | MDPI AG | . | . |
| Organisation and activity of the I.R. Agricultural society of Vienna | 1913-1913 | BioDiversity Heritage Library | . | . |
| Organisational Project Management | 2014-2016 | UTSePress | . | . |
| Organisms Diversity & Evolution Electronic Supplement | 2001-2006 | Gesellschaft fur Biologische Systematik (GfBS) (Germany) | . | . |
| Organisms Journal of Biological Sciences | 2017- | Sapienza Università di Roma | . | . |
| Organizacija | 2008- | Sciendo | . | . |
| Organizações & Sociedade | 2000- | Universidade Federal da Bahia | . | . |
| Organizações & Sociedade | 1996- | SciELO (Brasil) | . | . |
| Organizações & Sociedade | 2005- | Red ALyC | . | . |
| Organizações e Sustentabilidade | 2013- | Universidade Estadual de Londrina | . | . |
| Organizações Rurais e Agroindustriais | 1996- | Universidade Federal de Lavras | . | . |
| Organizações Rurais e Agroindustriais | 2005- | Red ALyC | . | . |
| Organizações Rurais e Agroindustriais | 2000- | University of Minnesota Libraries | . | . |
| Organization and Management | 2010- | Polska Akademia Nauk | . | . |
| Organization Management Journal | 2020- | Emerald | . | . |
| Organization Technology & Management in Construction | 2009-2012 | Hrcak | . | . |
| Organization Technology & Management in Construction | 2016- | Sciendo | . | . |
| Organizational aesthetics | 2007- | Society for Organizational Aesthetics Research | . | . |
| Organizational Cybersecurity Journal Practice Process and People | 2021- | Emerald | . | . |
| Organizational Economics Proceedings | 2012- | University of Sydney | . | . |
| Organizational Science | 2012- excepto últimos 12 meses | J-STAGE, Japan Science and Technology Information Aggregator, Electronic | . | . |
| Organizations & Markets in Emerging Economies | 2010- | CEEOL | . | . |
| Organogenesis | 2004- | Taylor & Francis | . | . |
| Organogenesis | 2004- | PubMed Central | . | . |
| Organoids | 2022- | MDPI AG | . | . |
| Organon | 1995- | Universidade Federal do Rio Grande do Sul | . | . |
| Organon F International journal of analytic philosophy | 1994-2018 | Filosofický ústav Akademie věd České republiky | . | . |
| Organon F International journal of analytic philosophy | 1994- | Slovak Academy of Sciences | . | . |
| Organs-on-a-Chip | 2019- | Elsevier Science | . | . |
| Organum | 2018- | Universitas Winaya Mukti | . | . |
| Orient | 1960-2020 | J-STAGE, Japan Science and Technology Information Aggregator, Electronic | . | . |
| Orient Bulletin | 1999- | Zentrum Moderner Orient | . | . |
| Orient Deutsche Zeitschrift für Politik Wirtschaft und Kultur des Orients | 2007- | Deutsche Orient-Stiftung | . | . |
| Orientación gallega | 1962-1965 | Galiciana | . | . |
| Orientacion y Sociedad Revista Internacional e Interdisciplinaria de Orientacion Vocacional Ocupacional | 1999- | SciELO (Argentina) | . | . |
| Orientacion y Sociedad Revista Internacional e Interdisciplinaria de Orientacion Vocacional Ocupacional | 1999- | Universidad Nacional de la Plata | . | . |
| Oriental annual, or, Scenes in India / | 1834-1840 | BioDiversity Heritage Library | . | . |
| Oriental Journal of Chemistry | 2008- | Oriental Scientific Publishing | . | . |
| Oriental Journal of Computer Science and Technology | 2008- | Oriental Scientific Publishing Company | . | . |
| Oriental serial publications in the zoological sciences | 1963 | BioDiversity Heritage Library | . | . |
| Oriental Studies | 2008- | elpub.ru | . | . |
| Orientalia Suecana | 1952- | Uppsala University | . | . |
| Orientando | 2011- | Universidad Veracruzana | . | . |
| Orientes do Portugues | 2019- | Universidade do Porto | . | . |
| Originais reprovados A revista literária dos alunos de USP | 2009- | USP Portal del Revistas | . | . |
| Origins and Design | 1996-1999 | Access Research Network | . | . |
| Orillas Studi d'ispanistica | 2012- | Padova University Press | . | . |
| Orinoquia | 2003- | Red ALyC | . | . |
| Orinoquia | 2004-2012 | Imbiomed | Registro individual requerido | . |
| Orinoquia | 2011- | Dialnet | . | . |
| Orinoquia | 2010- | SciELO (Colombia) | . | . |
| Orinoquia | 2003- | Universidad de Los Llanos | . | . |
| oriole : official organ of the Somerset Hills Bird Club | 1914-1915 | BioDiversity Heritage Library | . | . |
| Oriole The Quarterly Journal of the Georgia Ornithological Society | 2005-2013 | SORA | . | . |
| Oriole The Quarterly Journal of the Georgia Ornithological Society | 1936-2006 | Georgia Ornithological Society | . | . |
| Orion | 1985- | Operations Research Society of South Africa (ORSSA) | . | . |
| ORiON | 2004- | AJOL | . | . |
| Orissa Journal of Psychiatry | 2006-2012 | Indian Psychiatric Society | . | . |
| Orissa Journal of Psychiatry | 2022- | Lippincott Williams & Wilkins | . | . |
| Orissa review | 1972-1994 | Government of Orissa | . | . |
| Orizzonte Cina | 2010- | Università di Torino | . | . |
| ORL journal for oto rhino laryngology and its related specialties | 2009-2010 | PubMed Central | Artículos selectos | . |
| ORL ro | 2015- | MedicHub Media | . | . |
| Orlando Business Journal | 1996- | American City Business Journals Inc. | . | . |
| Ornamental Horticulture | 1995- | Sociedade Brasileira de Floricultura e Plantas Ornamentais | . | . |
| Ornamental Horticulture | 2017- | SciELO (Brasil) | . | . |
| Ornamental Plant Research | 2021- | Maximum Academic Press | . | . |
| Ornis | 1885-1910 | BioDiversity Heritage Library | . | . |
| Ornis | 1886-1910 | BioDiversity Heritage Library | . | . |
| Ornis Fennica | 2021- | BirdLife Finland | . | . |
| Ornis Hungarica Scientific Journal of the BirdLife Hungary | 1991- | Hungarian Ornithological and Nature Conservation Society | . | . |
| Ornis Hungarica Scientific Journal of the BirdLife Hungary | 2012- | Sciendo | . | . |
| Ornithological Monographs | 1964-2005 | SORA | . | . |
| Ornithological Newsletter | 1997- | Ornithological Societies of North America (OSNA) | . | . |
| Ornithological report | 1965-1988 | BioDiversity Heritage Library | . | . |
| Ornithological Science | 2002- | J-STAGE, Japan Science and Technology Information Aggregator, Electronic | selecciones disponibles | . |
| Ornithologische Monatsberichte | 1894-1923 | BioDiversity Heritage Library | . | . |
| Ornithologische Monatsschrift | 1890-1922 | BioDiversity Heritage Library | . | . |
| Ornithologischer Anzeiger | 1991- | Landesmuseum | . | Cambio de: Anzeiger der Ornithologischen Gesellschaft in Bayern |
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| Ornithologisches Centralblatt | 1876-1879 | BioDiversity Heritage Library | . | . |
| Ornithologisches Centralblatt | 1880-1882 | BioDiversity Heritage Library | . | . |
| Ornithologisches Jahrbuch | 1890-1918 | BioDiversity Heritage Library | . | . |
| Ornithologist | 1885-1885 | BioDiversity Heritage Library | . | . |
| Ornithologist and botanist | 1891-1892 | BioDiversity Heritage Library | . | . |
| Ornithologist and oölogist | 1881-1893 | BioDiversity Heritage Library | . | . |
| Ornithologist; a magazine of ornithology and oölogy | 1896-1897 | BioDiversity Heritage Library | . | . |
| Ornithologists' and Oologists' Semi-Annual | 1889-1891 | BioDiversity Heritage Library | . | Cambio a: Semi-Annual (Agassiz Association. Department of the Wilson Chapter) |
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| Ornitologia Neotropical | 1990-2014 | SORA | . | . |
| Ornitologia Neotropical | 2015- | Simon Fraser University | . | . |
| Ornitologicheskii viestnik | 1910-1917 | BioDiversity Heritage Library | . | . |
| ORNL Review Oak Ridge National Laboratory | 1967- | U.S. Department of Energy, Oak Ridge National Laboratory | . | . |
| Oromia Law Journal | 2012- | AJOL | . | . |
| Orphan Drugs Research & Reviews | 2011-2017 | Dove Medical Press | . | . |
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| Orsis Organismes i Sistemes | 1985-2017 | Universidad Autónoma de Barcelona | . | . |
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| Orthopaedic Surgery | 2009- | PubMed Central | . | . |
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| Orthopedic Research and Reviews | 2016- | PubMed Central | . | . |
| Orthopedic Research and Reviews | 2009- | Taylor & Francis | . | . |
| Orthopedic Reviews | 2009- | Open Medical Publishing | . | . |
| Orthopedic Reviews | 2009- | PubMed Central | . | . |
| Orthopedics | 2009- | Slack Incorporated | . | . |
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| OS. Opificio della Storia | 2020- | SHARE Press | . | . |
| OSA Continuum | 2018-2021 | Optica Publishing Group | . | Cambio a: Optics Continuum |
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| Osasunkaria Vitoria Gasteiz | 1997-1999 | Gobierno Vasco | . | Cambio de: Sisva Vitoria |
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| Oslo Studies in Language | 2009- | University of Oslo | . | . |
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| Osprey : an illustrated monthly magazine of popular ornithology | 1896-1902 | BioDiversity Heritage Library | . | . |
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| Osservatorio Music | 2015- | Università di Torino | . | . |
| Ossietzky Zweimonathenschrift für Politik Kultur Wirtschaft | 2002- | Verlag Ossietzky | . | . |
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| Osteology | 2021- | MDPI AG | . | . |
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| Osteopathic Medicine and Primary Care | 2007-2010 | BioMed Central | . | . |
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| Osteuropa 1953-1980 | 1953-1980 | CEEOL | . | . |
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| Ostomy Wound Management | 2001-2018 | HMP Communications, LLC | . | Cambio a: Wound management & prevention |
| Ostrava Journal of English Philology | 2021- | University of Ostrava | . | . |
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