The archive has been collecting the written legacies of scientists from all disciplines since its inception. A personal archival fonds can provide a relatively complete picture of the life and work of its originator. It often provides indispensable information not only for the study of the history of science but also for other areas of the development of society. Personal fonds usually contain personal documents, correspondence, manuscripts of the author’s own works, documents from the public activities of the author, illustrative material, and sometimes also documents of family members and other persons. In this overview of personal fonds, the relevant archival files in the possession of the T. G. Masaryk Institute, o. p. s., are also listed for completeness.