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Encyclopedia Sites List
Browse 20 online encyclopedias and specialist references. Start with general knowledge or find a source by subject, region, language, or access type.
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Find an encyclopedia by subject
20 sites
General Encyclopedias
Start here for broad overviews, quick facts, and background reading.
- Free · Multilingual Wikipedia A collaborative encyclopedia covering a wide range of topics and languages.
- General reference · Free and paid Encyclopædia Britannica Editorially reviewed articles, biographies, maps, and illustrations.
- Free · Reference collection Encyclopedia.com Search entries from established encyclopedias, dictionaries, and other reference works.
- Free · Via Infoplease Columbia Encyclopedia Concise reference articles on people, places, science, and history.
- Subscription · Student reference World Book Online Encyclopedia articles, images, and research tools for students and schools.
Science, Math & Health
Explore research topics, mathematical concepts, species, computing, and health terms.
- Free · Peer-reviewed Scholarpedia Expert-written entries in areas such as neuroscience, physics, and mathematics.
- Free · Mathematics Wolfram MathWorld Definitions, formulas, and worked examples across branches of mathematics.
- Free · Biodiversity Encyclopedia of Life Species pages that bring together descriptions, images, and information from multiple sources.
- Free · Health MedlinePlus Medical Encyclopedia A U.S. National Library of Medicine resource on conditions, symptoms, tests, and procedures.
- Free · Computing Computer Desktop Encyclopedia Quick explanations of computer hardware, software, and technical terms.
Philosophy
Compare academic explanations of philosophers, ideas, and debates.
History, Art & Culture
Browse civilizations, visual art, myths, and historical perspectives on religion.
- Free to browse · History World History Encyclopedia Articles, timelines, and maps on civilizations and historical events.
- Subscription · Visual arts Grove Art Online Oxford’s scholarly encyclopedia of art, artists, and architecture.
- Free · Mythology Encyclopedia Mythica Entries on mythological figures, folklore, and traditions from around the world.
- Free · Historical edition Catholic Encyclopedia A digitized early 20th-century reference on Catholic history and doctrine.
Regional & Language Encyclopedias
Find reference works focused on a country, region, or language.
- Free · English and French The Canadian Encyclopedia Articles on Canadian history, people, politics, and culture.
- Free · Texas history Handbook of Texas Texas State Historical Association entries on the state’s people, places, and history.
- Free · French Encyclopédie Larousse A French-language general encyclopedia from Larousse.
- Chinese · Collaborative Baidu Baike A Chinese-language encyclopedia hosted by Baidu.
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Some references offer subscription access through schools or libraries. For research, check the article’s author, date, and citations.