The Library of Congress.

“The papers of the author, educator, and political philosopher Hannah Arendt (1906-1975) are one of the principal sources for the study of modern intellectual life. Located in the Manuscript Division at the Library of Congress, they constitute a large and diverse collection reflecting a complex career. With over 25,000 items (about 75,000 digital images), the papers contain correspondence, articles, lectures, speeches, book manuscripts, transcripts of Adolf Eichmann’s trial proceedings, notes, and printed matter pertaining to Arendt’s writings and academic career. The entire collection has been digitized and is available to researchers in reading rooms at the Library of Congress, the New School University in New York City, and the Hannah Arendt Center at the University of Oldenburg, Germany. Parts of the collection and the finding aid are available for public access on the Internet.”

Online:
The Library of Congress