- Iddings, Henry, 1762-18541
- Iliff, James A.1
- Illig, John S. (John Stephens), 1825-19031
- Imboden, John D. (John Daniel), 1823-18951
- Independent Order of St. Luke (Blacksburg, Va.)1
- Infant Sanitarium (Virginia Beach, Va.)1
- Ingalls, James M. (James Monroe), 1837-19271
- Ingersoll, Charles Jared, 1782-18621
- Ingersoll, Robert Green, 1833-18991
- Ingram, John Henry, 1842-19161
- Institute for the History of Technology and Industrial Archaeology1
- International Association for Identification1
- Irby, Richard L. (Richard Logan), 1918-20021
- Irwin, David C1
- Irwin, L. W. (Leonidas Willson)1