This fonds consists of the personal and collected papers of the Honourable Leslie M. Frost, former Premier of Ontario. It contains correspondence; letter books from World War I through his legal and political career to post-retirement phase of public and private directorships; scrapbooks of Leslie Frost and his wife Gertrude; and historical files on various subjects, including the Frost family, the Carew family, various political figures, and Victoria, Peterborough and Haliburton Counties. The fonds is especially valuable for the study of Conservatism and it includes collected campaign material from 1891 to 1971, material on federal and provincial elections, and original and copied historical material on many individuals and events. Also included in the fonds are photographs, miscellaneous graphic materials, and audio visual materials.