Bulgaria

Primary and secondary sources

• Bulgaria State Archives provides access to digitised materials including Politburo and the Central Committee of the Communist Party archive, records of Jewish people in Bulgaria, Photo archive,  Bulgaria's People Court proceedings 1944-1945 archive, 1878 to 1945 Bulgarian Wars Archive, Art archive, and The Change of 1989 archive.
• Central Library of Bulgarian Academy of Science - digital collections includes digitised newspapers, rare books etc.
• Digital Library of Sofia University  'St.Kliment Ohridski' includes manuscripts, archives, books, periodicals, maps, pictures.
• Digital repository ‘Bulgarian Literary Modernism’ includes digitised literary periodicals of Bulgarian Modernism, and also e-library of selected critical interpretations. The total volume of materials is about 30,000 documents.
• The Ivan Shishmanov Virtual Library provides the opportunity to read the works of classical and contemporary Bulgarian authors in their English or German translations. Registration required for access.
• LiterNet portal from a publisher of electronic books and periodicals in the fields of literature and humanities, with free access to LiterNet and Bel online magazines, eBooks, publications and articles by Bulgarian authors.
• The Lit Club is an electronic library of the full-text Bulgarian and world literature. The website is regularly updated also publishing news in literary life of Bulgaria.
• Lost Bulgaria – online collection of 5800 photographs of Bulgarian history including wide variety of material, from photographs of everyday life to photographs of Balkan Wars, Ilinden Uprising and Archives of Bulgarian Royal Family. 
• Monasterium.net - Bulgarian collections - includes Medieval Documents of the Second Bulgarian Empire contributed by the Institute of Balkan Studies of the Serbian Academy of Sciences and Arts as part of the European Network on Archival Cooperation (ENArC) project.
• National Art Gallery of Bulgaria 
• NALIS - Bulgarian national academic library and information system repository provides access to over 604 thousand files of digitised and online resources from number of libraries involved in NALIS project, from digitised rare and valuable prints and archival materials from CL-BAS,  digital copies of theses from AUBG and SUL, to digital collection of medieval Slavonic manuscript fragments from  Ivan Vazov Plovdiv Public Library and many more.
• Rodina Stara Zagora Digital Library provides access to digitised periodicals and books from Rodina Library, as well as e-library of writers from Stara Zagora.
• Slovoto: Virtual Library of works of Bulgarian literature, including a small selection of works translated in English
• St. St. Cyril and Methodius National Library - digital collections contains digitised manuscripts, archives, pictures and portraits, maps, albums and graphics, old-printed books, and Bulgarian National Revival newspapers.
• The Todor Zhivkov Project contains documents by and about Todor Zhivkov.
• Young Bulgarian Artists presents talented Bulgarian artists, graduates of the National Academy of Art at the beginning of their career.

Statistical databases

• National Statistical Institute​ includes statistical data as well as digitised materials available in its Digital Library.
• Bulgarian National Bank