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| 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 | . | . |
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| OADI Rivista dell'Osservatorio per le Arti Decorative in Italia | 2010- | Università degli Studi di Palermo | . | . |
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| 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 | . | . |
| Obesities | 2021- | MDPI AG | . | . |
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| Obesity Science & Practice | 2015- | Wiley Online Library | . | . |
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| 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 | . | . |
| Obra digital: revista de comunicación | 2011- | Universitat de Vic | . | . |
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| Obras | 1999- | . | . | . |
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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 | . | . |
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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 | . | . |
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| 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 | . |
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| 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 | . | . |
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| Occasional papers of the Museum of Natural History, the University of Kansas | 1994-1996 | BioDiversity Heritage Library | . | . |
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| Occasional Papers of the Museum of Zoology Louisiana State University | 1938-1994 | SORA | . | . |
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| Occasional Papers on Mollusks. Museum of Comparative Zoology. Harvard University | 1945-1998 | BioDiversity Heritage Library | . | . |
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| Ocean & polar research | 1979- | Korea Ocean Research and Development Institute | . | . |
| Ocean Acidification | 2014- | de Gruyter | . | . |
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| Oceanides | 2003- | IPN-CICMAR | . | Cambio de: Investigaciones marinas CICIMAR |
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