Online version of Dissertation Abstracts from UMI Proquest. Good for US theses. It's free to search the database. To order full text costs $34 each. Digital Dissertations is a subset comprising all dissertations in the Dissertation Abstracts database with a degree date of the current and previous year. It's easier to search and browse and you also get 24 page previews before you buy.
Dissertations & Theses - Full Text contains more than 1.6 million entries with information about doctoral dissertations and master's theses. It is the same database as Dissertation Abstracts, but with the significant advantage that titles published since 1997 are available in PDF digital format and have 24 page previews available.
Citations for English-language doctoral dissertations on missions and on Christianity outside the West. Based on compilations of missions-related dissertations published in the July 1983, July 1993, and July 2003 issues of the International Bulletin of Missionary Research but now expanded and updated to include more than 6,000 records.
The Index to Theses provides total bibliographic control of all theses ever produced by British and Irish universities (1716 to the present). Access is by author, title, university, degree, year, and keyword. Abstracts are included for titles written since 1970. Full text is not provided, but copies of the dissertations may be requested through interlibrary loan.
NDLTD provides access to citations from thousands of digital dissertations and theses that are in PDF format. A significant number of these resources are freely available in full-text and can be viewed online.
"RIM® Online is a freely available database that indexes DMin and DMiss projects from reporting schools of theology accredited by the Association of Theological Schools in the United States and Canada. Indexing began in 1981."
Theses Canada provides access to bibliographic citations for all the theses in the National Library of Canada Theses Collection. Access to full-text theses is available for all items published between January 1, 1998 to August 31, 2002.
TREN provides citations to 6,800 theological theses/dissertations and conference papers. Items can then be purchased through this site. The opening page actually states that they have 10,000 theses/dissertations, but the search page allows searching of 6,800 items.