- IAWA Small Collections,, 1907/201357
- IAWA: International Archive of Women in Architecture Records, 1967/2013, bulk 1985/200841
- Ida Libby Dengrove sketches, 1972/19871
- Ignorance Club collection, 1908/20241
- Imogene M. King Papers, 1948/20161
- Improvisational Theatre (I.T.) records, 1986/20173
- Indochina Institute records, 1980/19891
- Inge Horton Architectural Collection, 1964/199947
- Ingleside Book Club Records, 1923/20231
- Institute for Advanced Public Policy Studies records, 1980/19991
- Institute for the History of Technology and Industrial Archaeology Records, 1875/2005, bulk 1980/200553
- Institute for the History of Technology and Industrial Archaeology, Records regarding Blair Mountain, 1906/1992, bulk 1990/19921
- Institute of Management Records, 1961/19882
- Instructive Visiting Nurses Association records, 1902/19996
- Intercollegiate Athletics Records, 1930/2023, bulk 1975/200065