Dissertation Abstracts provide information on theses and dissertations completed universities in the United States and some internationally. Only the abstracts are available; there please submit an interlibrary loan request for titles in this database. (Interlibrary Loan login, then click on "Request Materials.")
These are a list of search engines and databases you can use to find thesis and dissertations from other schools and from other countries. Some are specific to certain topics, regions, or university, while others are more general.
Note: Theses and Dissertations from other countries are not available for interlibrary loan. You will have to either buy a copy from one of the databases, find a free copy available online, or contact the author of the dissertation.