- IAWA: International Archive of Women in Architecture Records, 1967/2013, bulk 1985/20081
- Ian Gray, Interviewer, Oral Histories with Baltimore and Ohio Railroad Employees, 20151
- Icelandic Sheepdog Association of America Records, 2000/20161
- Ignorance Club collection, 1908/20241
- Imogene M. King Papers, 1948/20161
- Improvisational Theatre (I.T.) records, 1986/20173
- Inge Horton Architectural Collection, 1964/19991
- Ingleside Book Club Records, 1923/20231
- Institute Honors Program records, 2006/20162
- Intercollegiate Athletics Records, 1930/2023, bulk 1975/200017
- Intercollegiate Athletics records, 192011
- Internal Library Records, 1923/20231
- International Relations Club records, 1939/20222
- International Union of Women Architects (UIFA) Conference Materials, 1981/20243
- International art publishing collection, 2009/20237