- IAWA Small Collections, 1907/201318
- IAWA: International Archive of Women in Architecture Records, 1967/2013, bulk 1985/200829
- 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, 1964/199918
- Ingleside Book Club Records, 1923/20231
- Institute for Historical Biology Records, 2003/2004, bulk 2003/20042
- Institute for the History of Technology and Industrial Archaeology Records, 1875/2005, bulk 1980/200511
- Integration: Through Teachers' Eyes, 201311
- Intercollegiate Athletics Records, 1930/2023, bulk 1975/200045
- Intercollegiate Athletics records, 192027
- Internal Library Records, 1923/20236
- International Association for Identification Records, 1842/2012, bulk 1910/19592