- IAWA Small Collections,4
- IAWA: International Archive of Women in Architecture Records1
- Ignorance Club collection2
- Independent Order of Odd Fellows. St. Albans Lodge, No. 31 (St. Albans, Vt.) Minute Book2
- Independent Order of St. Luke Records6
- Index to Topographic Maps and Geologic Folios, Virginia1
- Inge Horton Architectural Collection109
- Institute for the History of Technology and Industrial Archaeology Records34
- Institute for the History of Technology and Industrial Archaeology, Records regarding Blair Mountain1
- Instructive Visiting Nurses Association records10
- Internal Library Records1
- International Association for Identification Records51
- International Order of Odd Fellows, Lodge 134, Ledgers1
- Ira E. Robinson Papers2
- Iron Gate, Virginia, Ledgers,1