Egyptian Arabic Wikipedia: a Wikipedia encyclopedia written in Egyptian Arabic language.
English
Encyclopedias written in English.
Academic American Encyclopedia
American Heritage New Pictorial Encyclopedic Guide to the United States (1965)
The American Peoples Encyclopedia (1948–1976); the 1948 edition was a 20-volume set published by Spencer Press, Inc., marketed by Sears Roebuck and Company; the 1962 edition was a revised 20-volume set published by Grolier Incorporated, and marketed by its subsidiary, The Richards Company, Inc.
Asian Encyclopedia of Law: legal encyclopedia from Lawi
Banglapedia: national encyclopedia of Bangladesh, available in English and Bengali
Barkham Burroughs' Encyclopaedia (1889), American encyclopedia and miscellany
Book of Knowledge
Britannica Junior
British Encyclopedia, or Dictionary of Arts and Sciences: 1809, 6 volumes
The British Encyclopedia: 1933, 10 volumes
Cambridge Encyclopedia: one-volume encyclopedia from Cambridge University Press
Canadian Encyclopedia: originally a multi-volume print encyclopedia from Hurtig Publishers focusing on Canadian topics (founded 1985); now a free, online-only publication of the Historica Dominion Institute
Chambers's Encyclopaedia (1859–1979)
The Children's Encyclopedia
Collier's Encyclopedia (1951–1998)
Collins Encyclopedia of Scotland: one-volume encyclopedia
Columbia Encyclopedia: one-volume encyclopedia from Columbia University Press
The Complete Compendium of Universal Knowledge (1891)
Compton's Encyclopedia: 26-volume encyclopedia
Cyclopædia, or an Universal Dictionary of Arts and Sciences (1728–1788)
Dictionary of the Middle Ages (1982–1989)
The Domestic Encyclopedia (1802, Am. editions 1803, 1821)
Encarta, digital multimedia encyclopedia by Microsoft
Encyclopædia Biblica: published in 1899
Encyclopædia Britannica: in print 1768–2010, online since 1994; see also the 1911 Encyclopædia Britannica
Encyclopædia Britannica Ultimate Reference Suite: available on DVD
Encyclopædia Iranica: history and contemporary topics related to Iranian peoples
Encyclopedia Americana
Encyclopedia Judaica: 26-volume English-language encyclopedia of the Jewish people and Judaism
Encyclopedia of Associations: also available online as Associations Unlimited
Encyclopedia of Distances: Springer-Verlag 2009
Encyclopedia of Law: 120.000-entry legal encyclopedia with a legal dictionary and legal thesaurus
Encyclopedia of Life: online collaborative encyclopedia intended to document all of the living species known to science
Encyclopedia MDPI: online encyclopedia focusing on scientific topics and is aimed at the scholarly community
Encyclopedia of New Zealand: country-specific historical encyclopedia, with contemporary topics
Encyclopaedia of Wales: one volume, also available in Welsh
Funk & Wagnalls Standard Encyclopedia
Global Encyclopedia: Grolier publication during the 1980s
Grolier Multimedia Encyclopedia
Kendal's Pocket Encyclopedia (1802, second edition 1811)
Lexicon Technicum (1704–1744)
Low's Encyclopaedia (1805–1811)
Merit Students Encyclopedia (1967–1992)
The Minor Encyclopedia (1803)
National Geographic Encyclopedia
New American Cyclopedia (1857–1866)
New American Desk Encyclopedia: small paperback encyclopedia
New International Encyclopaedia (1902–1927)
The Nuttall Encyclopaedia: 1900
Oracle Encyclopædia: five-volume encyclopedia published in 1895
Pears Cyclopaedia: one-volume encyclopaedia published annually in the United Kingdom (1897–2017)
The Penguin Encyclopedia: one-volume encyclopedia published by the Penguin Group
The Poets' Encyclopedia
Random House Encyclopedia: one-volume encyclopedia from Random House
TV Tropes (2004)
The Volume Library by Southwestern, 3-volume compendium with aspects of dictionary, almanac and encyclopedia
English Wikipedia (2001)
Simple English Wikipedia (2003)
World Book Encyclopedia: world's best selling print encyclopedia
Esperanto
Encyclopedias written in Esperanto.
Enciklopedio de Esperanto: two-volume encyclopedia about Esperanto issues (Budapest 1934); reprint in one volume, without the illustrations (1986)
Esperanto en perspektivo: encyclopedic handbook about Esperanto issues (Rotterdam and London 1974)
Esperanto Wikipedia (2001)
Estonian
Encyclopedias written in Estonian.
Eesti Entsüklopeedia (1932–1937)
Eesti nõukogude entsüklopeedia (1968–1976)
Eesti nõukogude entsüklopeedia (ENE) (1985–1990) / Eesti entsüklopeedia (EE) (1990–2006)
Eesti Üleüldise teaduse raamat ehk encyklopädia konversationi-lexikon: by Karl August Hermann (1900–1906)
ENEKE (1982–1986)
Estonica
TEA entsüklopeedia (2008)
Estonian Wikipedia (2002)
Finnish
Encyclopedias written in Finnish.
Facta (1969–1974)
Facta 2001
Factum (2003–2005)
Iso tietosanakirja (1931–1958)
Otavan iso tietosanakirja – Encyclopedia Fennica (1960–1965)
Pieni tietosanakirja (1925–1928)
Spectrum Tietokeskus (1976–1987)
Tiedon Värikäs Maailma (1972–1980)
Tietosanakirja (1909–1922)
Uusi tietosanakirja (1929)
Uusi Tietosanakirja (1960–1972)
Finnish Wikipedia (Suomenkielinen Wikipedia)
French
Encyclopedias written in French.
Claude Augé Nouveau Petit Larousse Illustré
Découvertes Gallimard: illustrated encyclopaedia in pocket format (1986–)
Encyclopædia Britannica: translated into French
Encyclopædia Universalis (1968–)
Encyclopédie (1751–1772)
Encyclopédie berbère (1984–)
Encyclopédie Méthodique: Panckoucke; 1782–1832
Encyclopédie nouvelle: Pierre Leroux and Jean Reynaud; 1839–1840
Grand Dictionnaire Encyclopédique Larousse
Grand dictionnaire universel du XIXe siècle: by Pierre Larousse (17 volumes 1866–1877); really an encyclopedia despite its name
Grand Larousse encyclopédique (1960–1964)
La Grande Encyclopédie: general secretaries of the editorial board Ferdinand-Camille Dreyfus and André Berthelot (31 volumes 1886–1902)
Nouveau Larousse illustré (1897–1904)
French Wikipedia (Wikipédia francophone)
Galician
Encyclopedias written in Galician.
Enciclopedia Galega Universal: on paper and online
Gran Enciclopedia Galega Silverio Cañada: on paper and DVD
Galician Wikipedia (Wikipedia en galego)
Georgian
Encyclopedias written in Georgian.
Georgian Soviet Encyclopedia
German
Encyclopedias written in German.
The Austro-Hungarian Monarchy in Word and Picture (1886–1902)
Bertelsmann Lexikothek (1967)
Brockhaus Enzyklopädie: in print 1796–2006, online-only since 2014
Conversations-Lexikon mit vorzüglicher Rücksicht auf die gegenwärtigen Zeiten (1796–1808; see Brockhaus)
Der kleine Brockhaus (1925–1962, a shorter encyclopedia published by F. A. Brockhaus AG)
Encyclopedic lexicon: by P. Gerakakis, I–V volumes, 1861–1865 (Γερακάκης, Πέτρος. Λεξικόν εγκυκλοπαίδειας: περιέχον τα κυριωτέρα των επιστημών και τεχνών)
Suda: historical encyclopedia of the ancient Mediterranean world (10th century)
Greek Wikipedia (Ελληνική Βικιπαίδεια)
Gujarati
Encyclopedias written in Gujarati.
Bhagavadgomandal: completed around by Bhagvatsingh of Gondal with the help of his education minister Chandulal Patel
Gujarati Vishwakosh (1985–2009)
Hebrew
Encyclopedias written in Hebrew.
Encyclopaedia Hebraica
Encyclopedia of the Holocaust
Encyclopaedia Biblica (Israel)
Encyclopedia Talmudit
Hebrew Wikipedia
Hindi
Encyclopedias written in Hindi.
Agropedia
Hindi Wikipedia
Hindi Vishvakosh (1969–1970)
VIGYANLY
Hindi translation complete
Hungarian
Encyclopedias written in Hungarian.
List of Hungarian encyclopedias
Icelandic
Encyclopedias written in Icelandic.
Íslenska alfræðiorðabókin A-Ö
Ido
Encyclopedias written in Ido.
Ido Wikipedia
Indonesian
Encyclopedias written in Indonesian language.
Ensiklopedi Ekonomi Bisnis dan Manajemen
Ensiklopedi Indonesia
Ensiklopedi Indonesia Seri Fauna
Ensiklopedi Indonesia Seri Geografi
Ensiklopedia Indonesia
Ensiklopedi Islam
Ensiklopedi Nasional Indonesia
Ensiklopedi politik
Ensiklopedi umum dalam bahasa Indonesia
Indonesian Wikipedia (Wikipedia in Indonesia)
Italian
Encyclopedias written in Italian.
Conoscere (1958–1963)
Dizionario Biografico degli Italiani
Dizionario enciclopedico italiano (1955–)
Dizionario enciclopedico universale (1995), two-volume Corriere della Sera encyclopedia
Dizionario storico della Svizzera
Enciclopedia Biografica Universale, Treccani
Enciclopedia italiana di scienze, lettere ed arti (1929–1960)
Federico II. Enciclopedia fridericiana, three-volume encyclopaedic work, entirely devoted to the emperor Frederick II and his time
Vita meravigliosa
Italian Wikipedia (Wikipedia in italiano)
Japanese
Encyclopedias written in Japanese.
The Heibonsha World Encyclopedia (世界大百科事典 Sekai Dai-hyakka Jiten)
Japanese Wikipedia
Kazakh
Encyclopedias translated into Kazakh.
Great Soviet Encyclopedia
Korean
Encyclopedias written in Korean.
Doosan Encyclopedia
Encyclopedia of Korean Culture
Global World Encyclopedia
Great Korean Encyclopedia
Jibong yuseol
Kwangmyong Encyclopedia
Korean Wikipedia
Namuwiki
Kurdish
Encyclopedias written in Kurdish.
Kurdistanica (1992)
Kyrgyz
Encyclopedias written in Kyrgyz.
Kyrgyz Soviet Encyclopedia
National encyclopedia «Kyrgyzstan»
«Manas» encyclopedia
Latin
Encyclopedias written in Latin.
De proprietatibus rerum: of Bartholomeus Anglicus
Etymologiae: of Isidore of Seville
Fons memorabilium universi: of Domenico Bandini of Arezzo
Liber de natura rerum: of Thomas of Cantimpré
Naturalis Historia: of Pliny the Elder
Nine Books of Disciplines: by Marcus Terentius Varro
Speculum Maius: of Vincent of Beauvais
Latin Wikipedia
Latvian
Encyclopedias written in Latvian.
Latviešu konversācijas vārdnīca, 1927–1940
Latvijas padomju enciklopēdija, 1981–1988
Latvian Wikipedia (2003)
Leonese
Encyclopedias written in Leonese.
Llionpedia (2009)
Lithuanian
Encyclopedias written in Lithuanian.
Macedonian
Encyclopedias written in Macedonian.
Encyclopedia of Yugoslavia: Macedonian edition; the first encyclopedia published in Macedonian
Macedonian Wikipedia (Википедија)
Malagasy
Encyclopedias written in Malagasy.
Rakibolana Rakipahalalana
Malagasy Wikipedia
Malayalam
Encyclopedias written in Malayalam.
Malayalam Britannica
Puranic EncyclopediaVettom Mani: published By DC Books
Sarva Vijyana Kosham
Viswa Sahitya Vijnanakosam
Malayalam Wikipedia
Marathi
Encyclopedias written in Marathi.
Marathi Vishwakosh - Original Edition (22 Volumes मराठी विश्वकोश मूळ आवृत्ती)
Marathi Vishwakosh - Original Edition: published online by Marathi Language Department, State Government of Maharashtra (मराठी विश्वकोश ज्ञानमंडळ आवृत्ती )
Norwegian
Encyclopedias written in Norwegian.
Caplex
Store norske leksikon
Norwegian Wikipedia
Persian
Encyclopedias written in Persian.
Dehkhoda Dictionary (Loghatnameh Dehkhoda)
Encyclopaedia of Persian Language and Literature
Encyclopedia of Iran and Islam
The Encyclopedia of Iranian Old Music (2000)
Encyclopedia of Islam World
Encyclopedia Islamica
The Persian Encyclopedia
Encyclopedia of Sophistication (2003)
Treasure Box of Knowledge (1993)
Persian Wikipedia (2004)
Polish
Encyclopedias written in Polish.
Britannica (Encyclopædia Britannica - Polish edition): 49 vols (1997–2005)
Encyklopedia białych plam: 20 vols (2000–2006)
Encyklopedia nowej generacji E2.0 (2008)
Encyklopedia ogólna wiedzy ludzkiej: 12 vols (1872–1877)
Encyklopedia podręczna ilustrowana według 2 najnowszego wydania "Macierzy Polskiej" we Lwowie, uzupełniona i opracowana do użytku naszych czytelników: 4 vols (1906)
Encyklopedia Polski (Encyclopedia of Poland; 1996)
Encyklopedia popularna ilustrowana treść wszystkich gałęzi wiedzy ludzkiej, podana przystępnie 4 vols (1909–1912)
Encyklopedia Powszechna Kieszonkowa (1888)
Encyklopedia Powszechna PWN: 4 vols (1973–1976)
Encyklopedia Powszechna PWN: 30 vols (2009–2010)
Encyklopedia Powszechna Ultima Thule: 10 vols (1927–1939)
Great Encyclopedia of PWN (Wielka Encyklopedia PWN): 31 vols (2001–2005)
Great Universal Encyclopedia of PWN (Wielka Encyklopedia Powszechna PWN) : 12 vols (1962–1970)
Ilustrowana encyklopedia: 6 vols (1925–1938)
Internet PWN Encyclopedia (Internetowa encyklopedia PWN): also referred to as Nowa Encyklopedia Powszechna PWN; a free Internet encyclopedia published by PWN
Nowa Encyklopedia Powszechna PWN: 8 vols (2004)
Nowe Ateny Albo Akademiia Wszelkiej Sciencyi Pełna, Na Różne Tytuły Jak Na Classes Podzielona, Mądrym Dla Memoryjału, Idiotom Dla Nauki, Politykom Dla Praktyki, Melankolikom Dla Rozrywki Erygowana (1745–1746)
S.Orgelbranda Encyklopedia Powszechna: edition I (1859–1868), edition II (1872–1876), edition III (1898, Orgelbranda Encyklopedia powszechna z ilustracjami i mapami); 28 vols
Wielka encyklopedia Oxford: 20 vols (2008)
Wielka encyklopedia powszechna ilustrowana: 55 vols (1890–1914)
Wielka ilustrowana encyklopedia powszechna: 20 vols (1929–1938)
Zbiór potrzebniejszych wiadomości (1781)
Polish Wikipedia
Portuguese
Encyclopedias written in Portuguese.
Barsa -
Biblioteca Universal: published by Texto Editora (paper, multimedia and online)
Diciopédia: published by Porto Editora (multimedia and online)
Enciclopédia Luso-Brasileira de Cultura: published by Editorial Verbo (1963–1995); 22 volumes
Enciclopédia Verbo Edição Século XXI: published by Editorial Verbo (since 1998); 29 volumes
Grande Enciclopédia Portuguesa e Brasileira: 40 volumes and later supplements (since 1936)
Infopédia: published by Porto Editora (online)
Portuguese Wikipedia
Romanian
Encyclopedias written in Romanian.
Dicționar enciclopedic român (1962–1966)
Enciclopedia Cugetarea (1940, 1999)
Enciclopedia Română (1899–1904)
Lexiconul Tehnic Român (1948–1968)
Romanian Wikipedia
Also, encyclopedias written in Moldavian:
Encyclopedia of Literature and Art of Moldavia ("Enciclopedia literaturii și a artei din Moldova"): a two-volume encyclopedia published by the Redacţia Principală a Enciclopediei Sovietice Moldoveneşti, in 1985-1986
Moldavian Soviet Encyclopedia ("Enciclopedia sovietico-moldoveană"): an eight-volume encyclopedia published by the Redacţia Principală a Enciclopediei Sovietice Moldoveneşti, in 1970-1981
Popular Medical Encyclopedia ("Enciclopedia medicală curentă"): a one-volume encyclopedia published by the Redacţia Principală a Enciclopediei Sovietice Moldoveneşti, in 1984
Moldavian Wikipedia (closed)
Russian
Encyclopedias written in Russian.
Brockhaus and Efron Encyclopedic Dictionary (Энциклопедический словарь Брокгауза и Ефрона, 1890–1906)
Encyclopedia of Domestic Animation (Энциклопедия отечественной мультипликации)
Encyclopedic lexicon (Энциклопедический лексикон): not finished, letters А–Д (1834–1841)
Geographical-statistical dictionary of Russian Empire (Географическо-статистический словарь Российской Империи) (1863–1885)
Great Russian Encyclopedia (Большая Российская энциклопедия, БРЭ)
Great Soviet Encyclopedia (Большая Советская энциклопедия, БСЭ)
Slovenski veliki leksikon (Mladinska knjiga, 2003–2005): set of 3 volumes: ISBN 86-11-14123-7, ISBN 86-11-15085-6, ISBN 86-11-16039-8
Encyclopedia of Yugoslavia (Slovene language edition)
Slovene Wikipedia (Slovenska Wikipedija)
Spanish
Encyclopedias written in Spanish.
Barsa
Diccionario Enciclopédico Espasa
Diccionario Enciclopédico Hispano-Americano de Literatura, Ciencias y Artes: Barcelona, Montaner y Simón, 1887–1899, reprints and appendices up to 1910: very readable articles, many written by known Spanish scholars of the day.; reprinted by the London editor Walter M. Jackson (C. H. Simonds Company, Impresores, Boston, Estados Unidos de Norte América)
Enciclonet
Enciclopedia Combi Visual
Enciclopedia Cousteau Mundo Submarino
Enciclopedia Estudiantil Editorial Codex
La Enciclopedia del Estudiante
Enciclopedia Encarta
Enciclopedia Jurídica Online: from Lawi; for Latin America and Spain; available online; edited by lawyers and academics
Enciclopedia Labor
Enciclopedia Libre Universal: also known as Enciclopedia Libre
Enciclopedia Salvat
Enciclopedia Temática Guinness
Enciclopedia universal ilustrada europeo-Americana: the biggest encyclopedia of its time; also known as Enciclopedia Espasa or Enciclopedia Espasa-Calpe
Enciclopedia Universal Micronet
Gran Enciclopedia Aragonesa
Gran Enciclopedia Asturiana
Gran Enciclopedia Extremeña
Gran Enciclopedia de Andalucía
Gran Enciclopedia Gallega
Gran enciclopedia planeta: 20 volumes, DVD and online encyclopedia, 2004
El Libro de los 1001 porqués
Lo sé todo
Monitor: enciclopedia Salvat para todos: 13 volumes, 1965–70
Nueva enciclopedia cumbre: published by Grolier in 14 volumes and available online
Nueva enciclopedia Durvan
El Nuevo Tesoro de la Juventud: published by Grolier in 20 volumes
Spanish Wikipedia (Wikipedia en español)
Swedish
Encyclopedias written in Swedish.
Bonniers familjelexikon (20 volumes, 1983–1986)
Bra böckers lexikon (4 editions of 25 volumes each, 1973–1995)
Focus (5 volumes, 1958–1960, introducing a new era of smaller modular encyclopedias, several later editions)
Kunskapens bok (6 editions, 8 or 9 volumes each, 1937–1959)
Lexikon 2000 (25 volumes, 1995)
Nationalencyklopedin (20 volumes, 1989–1996)
Nordisk familjebok (1876–1899; 2nd ed. 1904–1926)
Nordisk familjebok (editions 2-4 of 20+ volumes each, 1904–1957)
Susning.nu: a Swedish online wiki started in 2001; anyone-can-edit encyclopedia until 2004; shut down in 2009
Svensk uppslagsbok (2 editions, 31 and 32 volumes, 1929–1955)
Svenska uppslagsverk: a comprehensive bibliography maintained by collector Christofer Psilander
Encyclopædia Britannica: 28,000 articles: a three-volume encyclopaedia of selected articles from the English version and special articles on Tamil culture and history (பிரிட்டானிக்கா தகவல் களஞ்சியம்)
Encyclopaedia of Herbs (மூலிகைக் கலைக்களஞ்சியம்)
Islamic Encyclopaedia: written by Abdul Raheem (இஸ்லாமியக் கலைக்களஞ்சியம்)
Tamil Wikipedia: Currently has 1,38,627 articles on various fields; one of the main resources for articles in Tamil language
Telugu
Encyclopedias written in Telugu.
Andhra Vignana Sarvasvam (ఆంధ్ర విజ్ఞాన సర్వస్వము)
Ratchabandittayasathan Edition of Thai Encyclopedia (สารานุกรมไทย ฉบับราชบัณฑิตยสภา; 30 volumes, 1956–2016)
THAI JUNIOR ENCYCLOPEDIA FOUNDATION by His Majesty King Bhumibol Adulyadej The Great (สารานุกรมไทยสำหรับเยาวชน โดยพระราชประสงค์ในพระบาทสมเด็จพระบรมชนกาธิเบศร มหาภูมิพลอดุลยเดชมหาราช บรมนาถบพิตร; 44 volumes on going, 1973–present)
Pajana-Saranukrom Chabab Tunsamai by Pluang Na Nakhon (พจนะ-สารานุกรมฉบับทันสมัย โดย เปลื้อง ณ นคร; 2 volumes, First is Thai Dictionary, Second is Encyclopedia, 1975)
Thailand History Encyclopedia (สารานุกรมประวัติศาสตร์ไทย; 1974) and Thailand Cultural Encyclopedia (สารานุกรมวัฒนธรรมไทย) by So Playnoi (ส.พลายน้อย)