- IAWA Small Collections, 1907/20138
- IAWA: International Archive of Women in Architecture Records, 1967/2013, bulk 1985/200816
- Icelandic Sheepdog Association of America Records, 2000/20161
- Ignorance Club collection, 1908/20241
- Imogene M. King Papers, 1948/20161
- Improvisational Theatre (I.T.) records, 1986/20174
- Inge Horton Architectural Collection, 1964/19996
- Ingleside Book Club Records, 1923/20231
- Institute Honors Program records, 2006/20162
- Institute for the History of Technology and Industrial Archaeology Records, 1875/2005, bulk 1980/20052
- Institutional review board oral history project collection, 2007/200820
- Intercollegiate Athletics Records, 1930/2023, bulk 1975/200050
- Intercollegiate Athletics records, 192028
- Interdisciplinary Center for Economic Science records, 2006/20091
- Internal Library Records, 1923/20235