Many major museums and archives such as the Smithsonian Institute and Library of Congress have extensive collections of sound recordings that include oral histories. (The oral histories may not be listed separately.) You may find oral histories by searching for "interviews" or for keywords that relate to your topic. Remember that not all sound recordings of people speaking will meet the definition of an oral history.
Many oral histories and oral history transcripts that have been published either individually or as part of larger projects are available in libraries. Our library catalog offers access to many of these.
Starting on the University Library Catalog page, click on the Advance Search option. Using the dropdown menu under Search Filters, select "Subject" and enter "oral history" OR "oral histories" in the search term bar. Both of these terms are used to identify oral history projects in the catalog, so using both of them will produce more search results.
To further refine your results, consider adding terms that are more specific to your topic into a separate search term bar.
Sample search for ("oral history" OR "oral histories") AND "civil rights"
There are programs all over the world that are dedicated to collecting and creating oral histories. Here are examples of some that the University of Illinois provides access to.
There are also many archives who collect oral histories as part of their primary source collections. Here are some examples of archives who specifically mention their oral history collections and are accessible through the University Library.