European/Combined
- Biblioteca Virtual Miguel de Cervantes Tesis doctorales (Spain)
- Center for Research Libraries – CRL Dissertations (90+ countries)
- DART-Europe
- ?lektronnai?a biblioteka–dissertat?sii – Digital Library: Dissertations (Russia)
- EThOS (UK)
- Europeana: Dissertations
- Index to Theses (UK and Ireland)
- Katalog der Deutschen Nationalbibliothek (Germany)
- National Digital Library of Theses and Dissertations (over 1 million records)
- Open Access Theses and Dissertations (over 800 institutions throughout the world)
- OpenThesis
- ProQuest Dissertations and Theses (most comprehensive collection from around the world, 1743 to present)
- Österreichische Dissertationsdatenbank (Austria)
- Système Universitaire de Documentation – Sudoc (France)
- Tesis Doctorals en Xarxa – Theses and Dissertations Online (Spain)
- Thèses (France)
Beyond Europe
- Airiti Library Theses and Dissertations (Taiwan)
- Bibliotheca Digital Brasileira de Teses e Dissertações
- Cybertesis (Latin America)
- Chinese Doctoral Dissertations
- Database of African Theses and Dissertations – DATAD
- Tesis digitales–Universidad de las Américas, Puebla, México
- Tesis Digitales–Universidad Nacional Autónoma de México
- Theses Canada
- Trove: Dissertations (Australia)
