- IAWA Small Collections,, 1907/201330
- IAWA: International Archive of Women in Architecture Records, 1967/2013, bulk 1985/200811
- Ida Libby Dengrove sketches, 1972/19871
- Ignorance Club collection, 1908/20241
- Imogene M. King Papers, 1948/20161
- Inez Orler, Author (1880-1979), Unpublished Manuscripts, 1978/19821
- Inge Horton Architectural Collection, 1964/199960
- Ingleside Book Club Records, 1923/20231
- Institute for the History of Technology and Industrial Archaeology Records, 1875/2005, bulk 1980/200557
- Institute for the History of Technology and Industrial Archaeology, Records regarding Blair Mountain, 1906/1992, bulk 1990/19921
- Institute of Contemporary Art, 1979/19842
- Institute of Management Records, 1961/19882
- Institute on the Teaching of Latin Records, 1938/1980, bulk 1938/19802
- Instructive Visiting Nurses Association records, 1902/199921
- Intercollegiate Athletics Records, 1930/2023, bulk 1975/200061