Proquest Dissertation
https://wwwlib.umi.com/dissertations

Theses Canada Portal
https://www.collectionscanada.ca/thesescanada/index-e.html

Theological Research Exchange Network (TREN)
https://www.tren.com/

Diplomarbeiten Agentur diplom.de
https://www.diplomica.com/welcome.html

Dissertations & Abstract Database
https://www.dissertation.com/

Networked Digital Library of Theses and Dissertations
https://www.ndltd.org/

Database of African Theses and Dissertations
https://www.aau.org/datad/

American Political Science Association Graduate Student Connection
https://www.apsanet.org/opps/grad/

Latin American and Caribbean Studies Research Portal
https://www.sas.ac.uk/ilas/handbook/search_index.asp

Action Research Resources
https://www.scu.edu.au/schools/gcm/ar/arhome.html

Guide To Electronic Theses and Dissertations
https://etdguide.org/default.htm

American Historical Association Directory of Dissertations in Progress
https://www.historians.org/pubs/dissertations/

Digital Library of ETDs (Electronic Theses and Dissertations
https://www.theses.org/

BASES DE DATOS DE TESIS DOCTORALES (TESEO)
https://www.mcu.es/TESEO/index.html

Electronic Theses and Dissertations
https://www.lib.ncsu.edu/etd/

Concordia University Theses
https://library.concordia.ca/help/howto/theses.php#theses

Australian Digital Theses Program
https://adt.caul.edu.au/

UNT Electronic Theses & Dissertations
https://www.library.unt.edu/theses/

ProQuest Digital Dissertations
https://wwwlib.umi.com/dissertations/